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Spin Dynamics: Fast Switching of Macro-spins Read chapter Read first chapter

2009 | OriginalPaper | Chapter

12. High-Temperature Samarium Cobalt Permanent Magnets

Author : Oliver Gutfleisch

Published in: Nanoscale Magnetic Materials and Applications

Publisher: Springer US

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Abstract

This chapter reviews the development of SmCo-type magnets over the last 40 years. First, the physical metallurgy and crystal structures are considered; then the focus is on the recent developments in high-temperature Sm(CobalFe w Cu x Zr y ) z magnets suitable for operation temperatures up to 500°C. It is elucidated that the evolution of coercivity and microchemistry in the respective phases of the heterogeneous nanostructure as well as magnetic domain structure is very sensitive to details of the processing procedure, especially to the slow cooling ramp as the last step where the hard magnetic properties evolve. These changes give rise to rather complex pinning mechanisms in a three-phase precipitation structure, which again depend in a subtle manner on the microchemistry of the 1:5-type cell boundary phase in the 2:17-type magnets. It is the amount and distribution of Cu in and at the cell boundary phase which is the prevalent factor determining the pinning strength and which can yield a non-monotonic temperature dependence of coercivity. The chapter concludes with an overview of novel non-equilibrium processing routes used to obtain SmCo-type nanocomposites.

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Literature
1.
Al-Omari, I.A., J. Shobaki, R. Skomski, D. Leslie-Pelecky, J. Zhou and D.J. Sellmyer. (2002). High-temperature magnetic properties of SmCo6.7 − xCu0.6Tix magnets. Physica B: Cond. Matter 321: 107–111.CrossRef
2.
Barthem, V.M.T.S., D. Givord, M.F. Rossignol and P. Tenaud. (2002). An approach to coercivity relating coercive field and activation volume. Physica B 319: 127–132.CrossRef
3.
Buschow, K.H.J. and A.S. van der Goot. (1968). Intermetallic compounds in the system samarium-cobalt. J. Less-Common Met. 14: 323–328.CrossRef
4.
Buschow, K.H.J. and A.S. van der Goot. (1971). Composition and crystal structure of hexagonal Cu-rich rare earth-copper compounds. Acta Cryst. B 27: 1085–1088.CrossRef
5.
Buschow, K.H.J., (1989). Chapter 1, Permanent magnet materials based on 3d-rich ternary compounds. In: Ferromagnetic Materials, vol. 4, E. P. Wohlfarth and K.H.J. Buschow (eds.), North-Holland Elsevier, Amsterdam, Netherlands.
6.
Buschow, K.H.J. (1997). Chapter 4, Magnetism and processing of permanent magnet materials. In: Handbook of Magnetic Materials, vol. 10, K.H.J. Buschow (ed.), North Holland Elsevier, Amsterdam, Netherlands.
7.
Cataldo, L., A. Lefevre, F. Ducret, M.Th. Cohen-Adat, C.H. Allibert and N. Valignat. (1996). Binary system Sm-Co: revision of the phase diagram in the Co rich field. J. Alloys Comp. 241: 216–223.CrossRef
8.
Chen, C., M.S. Walmer, M.H. Walmer, S. Liu, G.E. Kuhl and G. Simon. (1998). Sm2(Co, Fe, Cu, Zr)17 magnets for use at temperature ≥ 400ºC. J. Appl. Phys. 83: 6706–6708.CrossRef
9.
Chen, C., M.S. Walmer, M.H. Walmer, S. Liu, G.E. Kuhl and G.K. Simon. (1999). New series of Sm2TM17 magnet materials for application at temperatures up to 550°C. In: MRS Symp. Proc. Advanced Hard and Soft Magnets, vol. 577, J. Fidler, M. Coey et al. (eds.), Materials Research Society, Pittsburgh, USA, pp. 277–287.
10.
Chen, C., M.H. Walmer, E.H. Kottcamp and W. Gong. (2001). Surface reaction and Sm depletion at 550°C for high temperature Sm-TM magnets. IEEE Trans. Mag. 37: 2531–2533.CrossRef
11.
Chikazumi, S. (1997). Physics of Ferromagnetism, 2nd ed. Oxford Science Publications, Oxford, p. 276.
12.
Coey, J.M.D. (ed.). (1996) Rare Earth Iron Permanent Magnets. Clarendon Press, Oxford, UK.
13.
Craik, D.J. and E.D. Isaac. (1960). Magnetic interaction domains. Proc. Phys. Soc. (Research Notes) 76.
14.
Cullity, B.D. (1972). Introduction to Magnetic Materials. Addison-Wesley Publishing Company, Reading, MA.
15.
Delannay, F., S. Derkaoui and C.H. Allibert. (1987a). The influence of zirconium on Sm(CoFeCuZr)7.2 alloys for permanent magnets I: identification of the phases by transmission electron microscopy. J. Less-Common Met. 134: 249–262.CrossRef
16.
Delannay, F., S. Derkaoui and C.H. Allibert. (1987b). Transmission electron microscopy of Sm(CoFeCuZr)7.2 alloys for permanent magnet. Micron Microscopica Acta 18: 243.CrossRef
17.
Derkaoui, S., C.H. Allibert, F. Delannay and J. Laforest. (1987). The influence of zirconium on Sm(Co,Fe,Cu,Zr)7.2 alloys for permanent magnets II: composition and lattice constants of the phases in heat-treated materials. J. Less-Common Met. 136: 75–86.CrossRef
18.
Derkaoui, S. and C.H. Allibert. (1989). Redetermination of the phase equilibria in the system Sm-Co-Cu for Sm content 0–20 at.% at 850°C. J. Less-Common Met. 154: 309–315.CrossRef
19.
Derkaoui, S., N. Valignat and C.H. Allibert. (1996a). Co corner of the system Sm-Co-Zr: decomposition of the phase 1:7 and equilibria at 850°C. J. Alloys Comp. 235: 112–119.CrossRef
20.
Derkaoui, S., N. Valignat and C.H. Allibert. (1996b). Phase equilibria at 1150°C in the Co-rich alloys Sm-Co-Zr and structure of the 1:7 phase. J. Alloys Comp. 232: 296–301.CrossRef
21.
Ding, J., P.G. McCormick and R. Street. (1994). A study of Sm13(Co1-xFex)87 prepared by mechanical alloying. J. Magn. Magn. Mat. 135: 200–204.CrossRef
22.
Durst, K.D. and H. Kronmüller. (1985). Magnetic hardening mechanisms in sintered Nd-Fe-B and Sm(Co,Fe,Cu,Zr)7.6 permanent magnets. Proc. 4th Int. Symp. Magn. Anisotropy and Coercivity in RETM Alloys, Dayton, USA, pp. 725–735.
23.
Durst, K.D., H. Kronmüller, F.T. Parker and H. Oesterreicher. (1986). Temperature dependence of coercivity of cellular Sm2Co17-SmCo5 permanent magnets. Phys. Stat. Sol. (a) 95: 213–219.CrossRef
24.
Durst, K.D., H. Kronmüller and W. Ervens. (1988a). Investigations of the magnetic properties and demagnetisation processes of an extremely high coercive Sm(Co,Cu,Fe,Zr)7.6 permanent magnet – I Determination of intrinsic magnetic material parameters. Phys. Stat. Sol. (a) 108: 403–416.CrossRef
25.
Durst, K.D., H. Kronmüller and W. Ervens. (1988b). Investigations of the magnetic properties and demagnetisation processes of an extremely high coercive Sm(Co,Cu,Fe,Zr)7.6 permanent magnet – II The coercivity mechanism. Phys. Stat. Sol. (a) 108: 705–719.CrossRef
26.
Ervens, W. (1979). Rare earth-transition metal 2:17 permanent magnet alloys, state and trends. Goldschmidt Informiert 48: 3–9.
27.
Fidler, J. and P. Skalicky. (1982a). Coercivity of precipitation hardened cobalt rare earth 17:2 permanent magnets. J. Magn. Magn. Mat. 30: 58–70.CrossRef
28.
Fidler, J. and P. Skalicky (1982b, September). Domain wall pinning in REPM. In: Proc. 3rd Int. Symp. Magnetic Anisotropy and Coercivity in Rare Earth-Transition Metal Alloys, J. Fidler(ed.), Baden, Austria, pp. 585–597.
29.
Gavigan, J.P. and D. Givord. (1990). Intrinsic and extrinsic properties of rare earth-transition metal compounds and permanent magnets. J. Magn. Magn. Mat. 84: 288–298.CrossRef
30.
Givord, D., A. Lienard, P. Tenaud and T. Viadieu. (1987). Magnetic viscosity in Nd-Fe-B sintered magnets. J. Magn. Magn. Mat. 67: L281–L285.CrossRef
31.
Givord, D., P. Tenaud and T. Viadieu. (1988). Coercivity mechanisms in ferrites and rare earth transition metal sintered magnets(SmCo5,Nd-Fe-B). IEEE Trans. Magn. 24: 1921–1923.CrossRef
32.
Givord, D., M. Rossignol and V.M.T.S. Barthem. (2003). The physics of coercivity. J. Magn. Magn. Mat. 258–259: 1–5.CrossRef
33.
Goll, D., I. Kleinschroth, W. Sigle and H. Kronmüller. (2000). Melt-spun precipitation-hardened Sm2(Co,Cu,Fe,Zr)17 magnets with abnormal temperature dependence of coercivity. Appl. Phys. Lett. 76: 1054–1056.CrossRef
34.
Goll, D. and H. Kronmüller. (2002). Micromagnetic analysis of pinning-hardened nanostructured, nanocrystalline Sm2Co17 based alloys. Scripta Mat. 47: 545–550.CrossRef
35.
Goll, D., H. Kronmüller and H.H. Stadelmaier. (2004). Micromagnetism and the microstructure of high-temperature permanent magnets. J. Appl. Phys. 96: 6534–6545.CrossRef
36.
Gopalan, R., K. Hono, A. Yan and O. Gutfleisch. (2009). Direct evidence on Cu-concentration variation and its correlation to coercivity in Sm(Co0.74Fe0.1Cu0.12Zr0.4)7.4 ribbons, Scripta. Mat. 60: 764–767.
37.
Gutfleisch, O. and I.R. Harris. (1996). Fundamental and practical aspects of the hydrogenation, disproportionation, desorption and recombination process. J. Phys. D: Appl. Phys. 29: 2255–2265.CrossRef
38.
Gutfleisch, O., M. Kubis, A. Handstein, K.H. Müller and L. Schultz. (1998). Hydrogenation disproportionation desorption recombination in Sm–Co alloys by means of reactive milling. Appl. Phys. Lett. 73: 3001–3003.CrossRef
39.
Gutfleisch, O. (2000). Controlling the properties of high energy density permanent magnetic materials by different processing routes. J. Phys. D: Appl. Phys. 33: R157–R172.CrossRef
40.
Gutfleisch, O., N.M. Dempsey, A. Yan, K.-H. Müller and D. Givord. (2004). Coercivity analysis of melt-spun Sm2(Co,Fe,Cu,Zr)17. J . Magn. Magn. Mat. 272–276: 647–649.CrossRef
41.
Gutfleisch, O., K.-H. Müller, K. Khlopkov, M. Wolf, A. Yan, R. Schäfer, T. Gemming and L. Schultz. (2006). Evolution of magnetic domain structures and coercivity in high-performance SmCo 2:17 type permanent magnets. Acta Mat. 54: 997–1008.CrossRef
42.
Hadjipanayis, G.C. (1996). Microstructure and magnetic domains. In: Rare-Earth Iron Permanent Magnets, J.M.D. Coey (ed.), Oxford University Press, Oxford, UK, pp. 286–335.
43.
Hadjipanayis, G.C., W. Tang, Y. Zhang, S.T. Chui, J.F. Liu, C. Chen and H. Kronmüller. (2000). High temperature 2:17 magnets: relationship of magnetic properties to microstructure and processing. IEEE Trans. Magn. 36: 3382–3387.CrossRef
44.
Handstein, A., M. Kubis, O. Gutfleisch, B. Gebel and K.H. Müller. (1999). HDDR of Sm–Co alloys using high hydrogen pressures. J. Magn. Magn. Mat. 192: 73–76.CrossRef
45.
Handstein, A., A. Yan, G. Martinek, O. Gutfleisch, K.H. Müller and L. Schultz. (2003). Stability of magnetic properties of Sm2Co17-type magnets at operating temperatures larger than 400ºC. IEEE Trans. Magn. 39: 2923–2925.CrossRef
46.
Hofer, F. (1970). Physical metallurgy and magnetic measurements of SmCo5-SmCu5 alloys. IEEE Trans. Magn. 6: 221–224.CrossRef
47.
Hubert, A. and R. Schäfer (1998). Magnetic Domains – The Analysis of Magnetic Microstructures. Springer Verlag, Berlin, Germany.
48.
Kardelky, S., A. Gebert, O. Gutfleisch, A. Handstein, G. Martinek and L. Schultz. (2004). Corrosion behavior of Sm-Co based permanent magnets in oxidizing environments. IEEE Trans. Magn. 40: 2931–2933.CrossRef
49.
Katter, M., J. Weber, W. Assmus, P. Schrey and W. Rodewald. (1996). A new model for the coercivity mechanism of Sm2(Co,Fe,Cu,Zr)17 magnets. IEEE Trans. Magn. 32: 4815–4817.CrossRef
50.
Katter, M. (1998). Coercivity calculation of Sm2(Co,Fe,Cu,Zr)17 magnets. J. Appl. Phys. 83: 6721–6723.CrossRef
51.
Kerschl, P., A. Handstein, K. Khlopkov, O. Gutfleisch, D. Eckert, K. Nenkov, J.-C. Téllez-Blanco, R. Grössinger, K.-H. Müller and L. Schultz. (2005). High-field magnetisation of SmCo5 − xCux (x ≈ 2.5) determined in pulse fields up to 48 T. J. Magn. Magn. Mat. 290–291(part 1): 420–423.
52.
Khan, Y. (1973). The crystal structures of R2Co17 intermetallic compounds. Acta Crystall. Section B 29: 2502–2507.CrossRef
53.
Khlopkov, K., O. Gutfleisch, D. Eckert, D. Hinz, B. Wall, W. Rodewald, K.-H. Müller, and L. Schultz. (2004). Local texture in Nd-Fe-B sintered magnets with maximised energy density. J. Alloys Comp. 365: 259–265.CrossRef
54.
Kronmüller, H., K.-D. Durst, W. Ervens and W. Fernengel. (1984). Micromagnetic analysis of precipitation hardened permanent magnets. IEEE Trans. Magn. 20: 1569–1571.CrossRef
55.
Kronmüller, H. and D. Goll. (2002). Micromagnetic theory of the pinning of domain walls at phase boundaries. Physica B 319: 122–126.CrossRef
56.
Kubis, M., A. Handstein, B. Gebel, O. Gutfleisch, K.H. Müller and L. Schultz. (1999). Highly coercive SmCo5 magnets prepared by a modified hydrogenation-disproportionation-desorption-recombination process. J. Appl. Phys. 85: 5666–5668.CrossRef
57.
Kumar, K. (1988). RETM5 and RE2TM17 permanent magnets development. J. Appl. Phys. 63: R13–R57.CrossRef
58.
Lectard, E., C.H. Allibert and R. Ballou. (1994). Saturation magnetization and anisotropy fields in the Sm(Co1–xCux)5 phases. J. Appl. Phys. 75: 6277–6279.CrossRef
59.
Lefèvre, A., L. Cataldo, M.Th. Cohen-Adad, and B.F. Mentzen. (1997). A representation of the Sm-Co-Zr-Cu-Fe quinary system: a tool for optimisation of 2/17 permanent magnets. J. Alloys Comp. 262–263: 129–133.CrossRef
60.
Li, D. and K.J. Strnat. (1984). Domain structures of two Sm-Co-Cu-Fe-Zr “2–17” magnets during magnetization reversal. J. Appl. Phys. 55: 2103–2105.CrossRef
61.
Liu, J.F., T. Chui, D. Dimitrov and G.C. Hadjipanayis. (1998a). Abnormal temperature dependence of intrinsic coercivity in Sm(Co, Fe, Cu, Zr)z powder materials. Appl. Phys. Lett. 73: 3007–3009.CrossRef
62.
Liu, J.F., Y. Zhang, Y. Ding, D. Dimitrov, and G.C. Hadjipanayis (1998b). Rare earth permanent magnets for high temperature applications. In: Proc. of 15th Int. Workshop on Rare Earth Magnets and their Appl., Dresden, Germany, vol. 2, pp. 607–622.
63.
Liu, J.F., Y. Zhang, D. Dimitrov and G.C. Hadjipanayis. (1999). Microstructure and high temperature magnetic properties of Sm(Co,Cu,Fe,Zr)z (z = 6.7–9.1) permanent magnets. J. Appl. Phys. 85: 2800–2804.CrossRef
64.
Livingston, J.D. and M.D. McConnell. (1972). Domain-wall energy in cobalt-rare-earth compounds. J. Appl. Phys. 43: 4756–4762.CrossRef
65.
Livingston, J.D. (1975). Domains in sintered Co-Cu-Fe-Sm magnets. J. Appl. Phys. 46: 5259–5262.CrossRef
66.
Livingston, J.D. and D.L. Martin. (1977). Microstructure of aged (Co,Cu,Fe)7Sm magnets. J. Appl. Phys. 48: 1350–1354.CrossRef
67.
Matthias, T., G. Zehetner, J. Fidler, W. Scholz, T. Schrefl, D. Schobinger and G. Martinek. (2002). TEM-analysis of Sm(Co,Fe,Cu,Zr)z magnets for high-temperature applications. J. Magn. Magn. Mat. 242–245: 1353–1355.CrossRef
68.
Maury, C., L. Rabenberg and C.H. Allibert. (1993). Genesis of the cell microstructure in the Sm(Co,Fe,Cu,Zr) permanent magnets with 2:17 type. Phys. Stat. Sol. (a) 140: 57–72.CrossRef
69.
Meyer-Liautaud, F., S. Derkaoui, C.H. Allibert and R. Castanet. (1987). Structural and thermodynamic data on the pseudobinary phases R(Co1 − xCux)5 with R ≡ Sm, Y, Ce. J. Less-Common Met. 127: 231–242.CrossRef
70.
Morita, Y., T. Umeda and Y. Kimura. (1987). Phase transformation at high temperature and coercivity of Sm(Co,Cu,Fe,Zr)7-9 magnet alloys. IEEE Trans. Magn. 23: 2702–2704.CrossRef
71.
Nagel, H. (1979). Coercivity and microstructure of Sm(Co0.87Cu0.13)7.8. J. Appl. Phys. 50: 1026–1030.CrossRef
72.
Nesbitt, E.A., R.H. Willens, R.C. Sherwood and E. Bühler. (1968). New permanent magnet materials. Appl. Phys. Lett. 12: 361–362.CrossRef
73.
Oesterreicher, H., F.T. Parker and M. Misroch. (1979). Giant intrinsic magnetic hardness in SmCo5-xCux. J. Appl. Phys. 50: 4273–4278.CrossRef
74.
Ojima, T., S. Tomizawa, T. Yoneyama and T. Hori. (1977). Magnetic properties of new type of rare-earth cobalt magnets. IEEE Trans. Magn. 13: 1317–1319.CrossRef
75.
Panagiotopoulos, I., M. Gjoka and D. Niarchos. (2002). Temperature dependence of the activation volume in high-temperature Sm(Co,Fe,Cu,Zr)Z magnets. J. Appl. Phys. 92: 7693–7695.CrossRef
76.
Perkins, R.S., S. Gaiffi and A. Menth. (1975). Permanent magnet properties of Sm2(Co,Fe)17. IEEE Trans. Magn. 11: 1431–1433CrossRef
77.
Perkins, R.S. and S. Strässler. (1977). Interpretation of the magnetic properties of pseudobinary Sm2(Co,M)17 compounds. I. Magnetocrystalline anisotropy. Phys. Rev. B 15: 477–489; Interpretation of the magnetic properties of pseudobinary Sm2(Co,M)17 compounds. II. Magnetization. Phys. Rev. B 15: 490–495.CrossRef
78.
Perry, A.J. and A. Menth. (1975). Permanent magnets based on Sm(Co,Cu,Fe)z. IEEE Trans. Magn. 11: 1423–1425.CrossRef
79.
Perry, A.J. (1977). The constitution of copper-hardened samarium-cobalt permanent magnets. J. Less-Common Met. 51: 153–162.CrossRef
80.
Popov, A.G., A.V. Korolev and N.N. Shchegoleva. (1990). Temperature dependence of the coercive force of Sm(Co,Fe,Cu,Zr)7.3 alloys. Phys. Met. Metall. 69: 100–106.
81.
Rabenberg, L., R.K. Mishra, and G. Thomas. (1982a). Microstructure of precipitation hardened SmCo permanent magnets. J. Appl. Phys. 53: 2389–2391.CrossRef
82.
Rabenberg, L., R.K. Mishra, and G. Thomas. (1982b, September). Development of the cellular microstructure in the SmCo7.4-type magnets. In: Proc. 3rd Int. Symp. Magnetic Anisotropy and Coercivity in Rare Earth-Transition Metal Alloys, J. Fidler (ed.), Baden, Austria, pp. 599–608.
83.
Ray, A.E. (1984). Metallurgical behavior of Sm(Co,Fe,Cu,Zr)z alloys. J. Appl. Phys. 55: 2094–2096.CrossRef
84.
Ray, A.E. and S. Liu. (1992). Recent progress in 2:17 type permanent magnets. Proc. 12th Int. Workshop on RE Magnets and their Appl., Canberra, Australia, pp. 552–573.
85.
Schobinger, D., O. Gutfleisch, D. Hinz, K.H. Müller, L. Schultz and G. Martinek. (2002). High temperature magnetic properties of 2:17 Sm–Co magnets. J. Magn. Magn. Mat. 242–245: 1347–1349.CrossRef
86.
Schultz, L., K. Schnitzke, J. Wecker, M. Katter and C. Kuhrt. (1991). Permanent magnets by mechanical alloying. J. Appl. Phys. 70: 6339–6344.CrossRef
87.
Skomski, R. (1997). Domain-wall curvature and coercivity in pinning type Sm-Co magnets. J. Appl. Phys. 81: 6527–5629.
88.
Skomski, R. and J.M.D. Coey. (1999). Permanent Magnetism. Institute of Physics, Bristol.
89.
Skomski, R., A. Kashyap, Y. Qiang, and D.J. Sellmyer. (2003). Exchange through nonmagnetic insulating matrix. J. Appl. Phys. 93: 6477–6479.CrossRef
90.
Stadelmaier, H.H., E.-Th. Henig, G. Schneider and G. Petzow. (1988). The metallurgy of permanent magnets based on Co17Sm2. Z. Metallkd. 79: 313–316.
91.
Stadelmaier, H.H., B. Reinsch, and G. Petzow. (1998). Samarium-cobalt phase equilibria revisited; relevance to permanent magnets. Z. Metallkd. 89: 114–118.
92.
Stadelmaier, H.H., D. Goll, H. Kronmüller. (2005). Permanent magnet alloys based on Sm2Co17; phase evolution in the quinary system Sm-Zr-Fe-Co-Cu. Z. Metallkd. 96: 17–23.
93.
Streibl, B., J. Fidler and T. Schrefl. (2000). Domain wall pinning in high temperature Sm(Co,Fe,Cu,Zr)7-8 magnets. J. Appl. Phys. 87: 4765–4767.CrossRef
94.
Strnat, K.J., G. Hoffer, J. Olson, W. Ostertag and J.J. Becker. (1967). A family of new cobalt-base permanent magnetic materials. J. Appl. Phys. 38: 1001–1002.CrossRef
95.
Strnat, K.J. (1988). Chapter 2, Rare earth–cobalt permanent magnets. In: Ferromagnetic Materials, vol. 4, E.P. Wohlfarth, K.H.J. Buschow (eds.), North-Holland, Amsterdam, Netherlands.
96.
Strnat, K.J. and R.M.W. Strnat. (1991). Rare earth–cobalt permanent magnets. J. Magn. Magn. Mat. 100: 38–56.CrossRef
97.
Tang, H., Y. Liu and D.J. Sellmyer. (2002). Nanocrystalline Sm12.5(Co,Zr)87.5 magnets: synthesis and magnetic properties. J. Magn. Magn. Mat. 241: 345–356.CrossRef
98.
Tang, W., Y. Zhang and G.C. Hadjipanayis. (2000). Effect of Zr on the microstructure and magnetic properties of Sm(CobalFe0.1Cu0.088Zrx)8.5 magnets. J. Appl. Phys. 87: 399–403.CrossRef
99.
Tang, W., A.M. Gabbay, Y. Zhang, G.C. Hadjipanayis and H. Kronmüller. (2001). Temperature dependence of coercivity and magnetisation reversal in Sm(CobalFe0.1CuyZr0.4)7.0 magnets. IEEE Trans. Magn. 37: 2515–2517.CrossRef
100.
Walmer, M.S., C.H. Chen and M.H. Walmer. (2000). A new class of Sm-TM magnets for operating temperatures up to 550°C. IEEE Trans. Magn. 36: 3376–3381.CrossRef
101.
Wecker, J., M. Katter and L. Schultz. (1991). Mechanically alloyed Sm-Co materials. J. Appl. Phys. 69: 6058–6060.CrossRef
102.
Xiong, X.Y., T. Ohkubo, T. Koyama, K. Ohashi, T. Tawara and K. Hono. (2004). The microstructure of sintered Sm(Co0.72Fe0.20Cu0.055Zr0.025)7.5 permanent magnet studied by atom probe. Acta Mat. 52: 737–748.CrossRef
103.
Yan, A., W.-Y. Zhang, H.-W. Zhang and B. Shen. (2000). Melt-spun magnetically anisotropic SmCo5 ribbons with high permanent performance. J. Magn. Magn. Mat. 210: 10–14.CrossRef
104.
Yan, A., A. Bollero, O. Gutfleisch and K.H. Müller. (2002a). Microstructure and magnetization reversal in nanocomposite SmCo5/Sm2Co17 magnets. J. Appl. Phys. 91: 2192–2196.CrossRef
105.
Yan, A., A. Bollero, K.-H. Müller and O. Gutfleisch. (2002b). Fast development of high coercivity in melt-spun Sm(Co,Fe,Cu,Zr)z magnets. Appl. Phys. Lett. 80: 1243–1245,CrossRef
106.
Yan, A., A. Bollero, K.H. Müller and O. Gutfleisch. (2002c). Influence of Fe, Zr and Cu on microstructure and crystallographic texture of melt-spun 2:17 SmCo ribbons. J. Appl. Phys. 91: 8825–8827.CrossRef
107.
Yan, A., K.H. Müller and O. Gutfleisch. (2002d). Highly coercive melt-spun Sm(Co, Fe, Cu, Zr)z magnets prepared by simple processing. IEEE Trans. Magn. 38: 2937–2939.CrossRef
108.
Yan, A., O. Gutfleisch, T. Gemming and K.-H. Müller. (2003a). Microchemistry and reversal mechanism in 2:17-type Sm-Co magnets. Appl. Phys. Lett. 83: 2208–2210.CrossRef
109.
Yan, A., O. Gutfleisch, A. Handstein, T. Gemming and K.-H. Müller. (2003b). Microstructure, microchemistry, and magnetic properties of melt-spun Sm(Co,Fe,Cu,Zr)y magnets. J. Appl. Phys. 93: 7975–7977.CrossRef
110.
Yan, A., A. Bollero, O. Gutfleisch, K.-H. Müller, L. Schultz, (2004). Melt-spun precipitation hardened Sm(Co,Fe,Cu,Zr) z magnets, Mat. Sci. Eng. A375–377: 1169–1172.
111.
Yang, W., W. Ping, S. Zhenhua and Z. Shouzeng. (1992). 2:17 type temperature compensated magnets with high coercivity. In: Proc. of the 12th Int. Workshop on RE Magnets and their Appl., Canberra, Australia, pp. 249–257.
112.
Zhang, Y., W. Tang. G.C. Hadjipanayis, C. Chen, C. Nelson and K. Krishnan. (2000). Evolution of microstructure, microchemistry and coercivity in 2:17 type Sm–Co magnets with heat treatment. IEEE Trans. Magn. 37: 2525–2527.CrossRef
113.
Zhou, J., I.A. Al-Omari, J P. Liu and D.J. Sellmyer. (2000). Structure and magnetic properties of SmCo7-xTix with TbCu7-type structure. J. Appl. Phys. 87: 5299–5301.CrossRef
114.
Zhou, J., R. Skomski, and D.J. Sellmyer. (2003). Magnetic hysteresis of mechanically alloyed Sm–Co nanocrystalline powders. J. Appl. Phys. 93: 6495–6497.CrossRef
Metadata
Title
High-Temperature Samarium Cobalt Permanent Magnets
Author
Oliver Gutfleisch
Copyright Year
2009
Publisher
Springer US
Book
Nanoscale Magnetic Materials and Applications

Print ISBN: 978-0-387-85598-1

Electronic ISBN: 978-0-387-85600-1

Copyright Year: 2009

DOI
https://doi.org/10.1007/978-0-387-85600-1_12

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