Skip to main content
SpringerLink
Log in

The magnetocaloric effect of superfine magnets

  • Published:
Journal of Thermal Analysis and Calorimetry Aims and scope Submit manuscript

Abstract

The magnetocaloric effect (MCE) of aqua suspensions based on superfine magnetite (Fe3O4), hematite (α-Fe2O3), maghemite (γ-Fe2O3), samarium ferrite (SmFe2O4) and gadolinium ferrite (GdFe2O4) as well as of magnetite-based ferrofluids was calorimetrically determined in the range of the temperatures from 283 to 253 K. MCE has a positive magnitude for all investigated systems except a hematite-based system. For the suspensions on the basis of MCE temperature dependence it was determined that superfine magnetite transformed into α-Fe2O3 at the temperature above 328 K in contrast to monocrystal magnetite. For aqua suspensions of samarium ferrite and gadolinium ferrite and magnetite-based ferrofluids MCE temperature dependence has an extreme behavior which is connected with a second-order phase transition. For the first time it is established that the magnetocaloric effect (MCE) is greatly increased when the magnet is a nanosized material.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. V. V. Korolev, A. E. Zavadskii, V. I. Yashkova, O. V. Balmasova, K. N. Zheleznov and A. G. Ramazanova, Dokl. Akad. Nauk., 361 (1998) 362.

    CAS  Google Scholar 

  2. E. P. Kotov and M. I. Rudenko, Tapes and Disks in devices for magnetic recording, Moscow 1986, p. 224 (in Russian).

  3. L. A. Shmeleva, L. N. Savina, N. I. Dyupovkin and V. V. Korolev, Izv. Vyssh. Uchebn. Zaved., Khim. Khim. Tekhnol., 38 (1995) 71.

    CAS  Google Scholar 

  4. A. E. Zavadskii, V. V. Korolev, V. I. Yashkova, A. G. Ramazanova and V. A. Kobenin, Izv. Vyssh. Uchebn. Zaved., Khim. Khim. Tekhnol., 43 (2000) 124.

    CAS  Google Scholar 

  5. V. V. Korolev, A. S. Romanov and I. M. Arefyev, Zh. Fiz. Khim., 80 (2006) 380.

    Google Scholar 

  6. S. Tikadzumi, Physics of Ferromagnetism. Magnetic properties of substances, Moscow 1983, p. 304 (in Russian).

  7. V. P. Krasovskii and I. G. Fakidov, Zh. Eksp. Teor. Fiz., 39 (1960) 228.

    Google Scholar 

  8. S. A. Nikitin, U. V. Talalaeva and L. A. Chernikova, Zh. Eksp. Teor. Fiz., 65 (1973) 2058.

    CAS  Google Scholar 

  9. S. A. Nikitin, A. S. Andreenko and U. V. Talalaeva, Zn. Eksp. Teor. Fiz., 73 (1977) 228.

    CAS  Google Scholar 

  10. S. A. Nikitin, U. V. Talalaeva and A. S. Andreenko, Zh. Eksp. Teor. Fiz., 74 (1978) 205.

    CAS  Google Scholar 

  11. K. P. Belov and S. A. Nikitin, Magnetic Properties of Crystalline and Amorphous Media, Nauka, Novosibirsk 1989, p. 400 (in Russian).

    Google Scholar 

  12. K. P. Belov, Usp. Fiz. Nauk., 164 (1994) 603.

    Article  CAS  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Institute of Solution Chemistry of RAS, Ivanovo, Russia

    V. V. Korolev, I. M. Arefyev & A. G. Ramazanova

Authors
  1. V. V. Korolev
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. I. M. Arefyev
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. A. G. Ramazanova
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to V. V. Korolev.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Korolev, V.V., Arefyev, I.M. & Ramazanova, A.G. The magnetocaloric effect of superfine magnets. J Therm Anal Calorim 92, 691–695 (2008). https://doi.org/10.1007/s10973-008-9018-y

Download citation

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10973-008-9018-y

Keywords

Search

Navigation