Abstract
Spin valves with a CoFe/Dy/CoFe composition in the lower part of their structure have been manufactured by magnetron sputtering. The effect of prolonged storage and temperature on the structure and magnetotransport properties of spin valves has been studied. The change in the compensation temperature was used as an indicator of the intensity of diffusion processes in the exchange-coupled CoFe/Dy/CoFe structure. It has been revealed that diffusion induced changes in the magnetotransport properties become smaller with a decrease in the dysprosium layer thickness. It has been shown that the nanostructure still contains pure dysprosium, the atoms of which do not participate in the sperimagnetic ordering of the Dy–Co–Fe interface, even at a small nominal thickness (4 nm) of the dysprosium layer 3 months after sputtering.
Similar content being viewed by others
REFERENCES
S. Fust, S. Mukherjee, N. Paul, J. Stahn, W. Kreuzpaintner, P. Böni, and A. Paul, “Realizing topological stability of magnetic helices in exchange-coupled multilayers for all-spin-based system,” Sci. Rep. 6, 1–14 (2016).
H. Okuno, Y. Sakaki, and Y. Sakurai, “Magnetic properties and structures of compositionally modulated (Gd + Co) films,” J. Phys. D: Appl. Phys. 19, 873–884 (1986).
N. Sato and K. Habu, “Amorphous rare-earth–transition-metal thin films with an artificially layered structure,” J.Appl. Phys. 61, 4287–4289 (1987).
A. Tamion, F. Ott, P. -E. Berche, E. Talbot, C. Bordel, and D. Blavette, “Magnetization depth profile of (Fe/Dy) multilayers,” J. Met., Mater. Miner. 320, 2650– 2659 (2008).
A. V. Svalov, G. V. Kurlyandskaya, and V. O. Vas’kovskiy, “Thermo-sensitive spin valve based on layered artificial ferrimagnet,” Appl. Phys. Lett. 108, 063504 (2016).
L. I. Naumova, R. S. Zavornitsyn, M. A. Milyaev, M. V. Makarova, V. V. Proglyado, and V. V. Ustinov, “Magnetoresistive properties of Dy-based bottom spin valve,” IEEE Trans. Nanotechnol. 20, 866–872 (2021).
L. I. Naumova, M. A. Milyaev, R. S. Zavornitsyn, T. P. Krinitsina, V. V. Proglyado, and V. V. Ustinov, “Spin valve with a composite dysprosium-based pinned layer as a tool for determining Dy nanolayer helimagnetism,” Curr. Appl. Phys. 19, 1252–1258 (2019).
K. P. Belov, R. Z. Levitin, and S. A. Nikitin, “Ferro- and antiferromagnetism of rare earth metals,” Usp. Fiz. Nauk 82 (3), 449–498 (1964).
G. Scheunert, W. R. Hendren, A. A. Lapicki, P. Jesudoss, R. Hardeman, M. Gubbins, and R. M. Bowman, “Improved magnetization in sputtered dysprosium thin films,” J. Phys. D: Appl. Phys. 46, 152001 (2013).
K. Dumesnil, C. Dufour, Ph. Mangin, and G. Marchal, “Magnetic structure of dysprosium in epitaxial Dy films and in Dy/Er superlattices,” Phys. Rev. B 54 (9), 6407–6420 (1996).
L. I. Naumova, M. A. Milyaev, R. S. Zavornitsyn, T. P. Krinitsina, T. A. Chernyshova, V. V. Proglyado, V. V. Ustinov, “Magnetoresistive properties of CoFe/Cu/CoFe/Dy pseudo spin valves under conditions of interdiffusion of dysprosium and CoFe ferromagnetic alloy layers,” Phys. Met. Metallogr. 120 (5), 429–435 (2019).
D. Raasch, “Recording characteristics of Dy–FeCo based magneto-optical disks in comparison to other MO materials,” IEEE Trans. Magn. 29 (1), 34–40 (1993).
Z. C. Shan and D. J. Sellmyer, “Magnetism of rare-earth-transition-metal nanoscale multilayers,” Phys. Rev. B 42 (16), 433–445 (1990).
P. Hansen, S. Klahn, C. Clausen, G. Much, and K. Witter, “Magnetic and magneto-optical properties of rare-earth transition-metal alloys containing Dy, Ho, Fe, Co,” J. Appl. Phys. 69, 3194–3207 (1990).
V. O. Vas’kovskii, Magnetism of Nanosystems Based on Rare Earth and 3d-Transition Metals. Reader Book (UrSU, Yekaterinburg, 2007) [in Russian].
J. P. Rebouillat, A. Lienard, J. M. D. Coey, R. Arrese-Boggiano, and J. Chappert, “Magnetic structures and properties of the amorphous alloys DyT3; T = Fe, Co, Ni,” Phys. B 86–88, 773–774 (1977).
Z. Hu, J. Besbas, R. Smith, N. Teichert, G. Atcheson, K. Rode, P. Stamenov, and J. M. D. Coey, “Single-pulse all-optical partial switching in amorphous DyxCo1 – x and TbxCo1 – x with random anisotropy,” Appl. Phys. Lett. 120, 112401 (2022).
V. O. Vas’kovskii, E. V. Kudyukov, E. A. Stepanova, E. A. Kravtsov, O. A. Adanakova, A. S. Rusalina, K. G. Balymov, and A. V. Svalov, “Experimental study and modeling of the magnetic properties of Dy–Co films,” Phys. Met. Metallogr. 122 (5), 478–484 (2021).
S. A. Nikitin, “Magnetic structures in crystalline and amorphous substances,” Sorosovskii Obrazovatel’nyi Zhurn. 11, 87–95 (1996).
V. V. Ustinov, N. G. Bebenin, and I. A. Yasyulevich, “Spin current polarization and electrical conductivity in metal helimagnets,” J. Phys.: Conf. Ser. 1389, 012151 (2019).
V. V. Ustinov and I. A. Yasyulevich, “Electrical magnetochiral effect and kinetic magnetoelectric effect induced by chiral exchange field in helical magnetics,” Phys. Rev. B 102, 134421 (2020).
Funding
This study was supported by the Russian Scientific Foundation (project no. 22-22-00220).
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated by E. Glushachenkova
Rights and permissions
About this article
Cite this article
Naumova, L.I., Zavornitsyn, R.S., Milyaev, M.A. et al. The Magnetotransport Properties of Spin Valves Based on Exchange-Coupled Dy Helimagnetic and Co90Fe10 Ferromagnetic Nanolayers. Phys. Metals Metallogr. 123, 945–953 (2022). https://doi.org/10.1134/S0031918X22600932
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0031918X22600932