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Journal of Applied Physics / Volume 111 / Issue 7 / PROCEEDINGS OF THE 56TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS / Magneto-Optic, Magnetoelastic, and Magnetocaloric Materials

J. Appl. Phys. 111, 07A910 (2012); http://dx.doi.org/10.1063/1.3670987 (6 pages)

Magnetocaloric materials with first-order phase transition: thermal and magnetic hysteresis in LaFe11.8Si1.2 and Ni2.21Mn0.77Ga1.02 (invited)

K. P. Skokov1, V. V. Khovaylo1,2, K.-H. Müller1, J. D. Moore1, J. Liu1, and O. Gutfleisch1

1Institute for Metallic Materials, Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), Dresden D-01171, Germany
2National University of Science and Technology MISiS, Moscow 119049, Russia

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(Received 21 September 2011; accepted 17 October 2011; published online 10 February 2012)

This is a report on a comparative study of thermal and magnetic hysteresis in LaFe11.8Si1.2 and Ni2.21Mn0.77Ga1.02 polycrystalline samples near their first-order phase transitions by measurements of magnetization and direct measurements of the adiabatic temperature change, ΔTad(H). Based on the obtained M(T) and M(H) dependencies, H-T diagrams were constructed for both alloys and used to explain the ΔTad(H) dependencies. For low thermal hysteresis and a sharp transition in the temperature dependence of magnetization (LaFe11.8Si1.2), the field dependencies of ΔTad(H) are governed by the phase boundary between ferromagnetic and paramagnetic states. For large thermal hysteresis and a broad transition width in temperature (Ni2.21Mn0.77Ga1.02), the phase boundary has little impact on ΔTad(H). It is also shown that, in the phase transition region, ΔTad measured upon the first application of magnetic field (virgin ΔTad(H) leg) can differ from that measured upon subsequent runs of the field. This can lead to an overestimation of the magnetocaloric effect, if only the virgin leg of ΔTad(H) is considered.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL DETAILS
  3. RESULTS AND DISCUSSION
  4. CONCLUSIONS

KEYWORDS, PACS, and IPC

Keywords

ferromagnetic materials, gallium alloys, iron alloys, lanthanum alloys, magnetic hysteresis, magnetic transitions, magnetocaloric effects, manganese alloys, nickel alloys, paramagnetic materials, silicon alloys

PACS

  • 75.30.Sg

    Magnetocaloric effect, magnetic cooling

  • 75.20.En

    Metals and alloys

  • 75.50.Bb

    Fe and its alloys

  • 75.50.Cc

    Other ferromagnetic metals and alloys

  • 75.30.Kz

    Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

International Patent Classification (IPC)

  • C22C38/00

    Ferrous alloys, e.g. steel alloys

  • C22C19/00

    Alloys based on nickel or cobalt

  • C22C22/00

    Alloys based on manganese

  • H01F1/00

    Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3670987

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    V. V. Khovaylo, K. P. Skokov, O. Gutfleisch, H. Miki, T. Takagi, T. Kanomata, V. V. Koledov, V. G. Shavrov, G. Wang, E. Palacios, J. Bartolome, and R. Burriel, Phys. Rev. B 81, 214406 (2010).

    V. V. Khovaylo, K. P. Skokov, O. Gutfleisch, H. Miki, R. Kainuma, and T. Kanomata, Appl. Phys. Lett. 97, 052503 (2010)APPLAB000097000005052503000001.

    A. Fujita, S. Fujieda, Y. Hasegawa, and K. Fukamichi, Phys. Rev. B 67, 104416 (2003).

    A. Yan, K.-H. Müller, and O. Gutfleisch, J. Appl. Phys. 97, 036102 (2005)JAPIAU000097000003036102000001.

    V. V. Khovaylo, K. P. Skokov, Yu. S. Koshkid'ko, V. V. Koledov, V. G. Shavrov, V. D. Buchelnikov, S. V. Taskaev, H. Miki, T. Takagi, and A. N. Vasiliev, Phys. Rev. B 78, 060403 (2008).

    V. D. Buchelnikov, V. V. Sokolovskiy, H. C. Herper, H. Ebert, M. E. Gruner, S. V. Taskaev, V. V. Khovaylo, A. Hucht, A. Dannenberg, M. Ogura, H. Akai, M. Acet, and P. Entel, Phys. Rev. B 81, 094411 (2010).

    T. Krenke, S. Aksoy, E. Duman, M. Acet, X. Moya, L. Manosa, and A. Planes, J. Appl. Phys. 108, 043914 (2010)JAPIAU000108000004043914000001.

    J. D. Moore, G. K. Perkins, Y. Bugoslavsky, M. K. Chattopadhyay, S. B. Roy, P. Chaddah, V. K. Pecharsky, K. A. Gschneidner, Jr., and L. F. Cohen, Appl. Phys. Lett. 88, 072501 (2006)APPLAB000088000007072501000001.


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