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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, 07A905 (2012); http://dx.doi.org/10.1063/1.3670062 (3 pages)

Direct calorimetric measurements of isothermal entropy change on single crystal W-type hexaferrites at the spin reorientation transition

M. LoBue1, V. Loyau1, F. Mazaleyrat1, A. Pasko1, V. Basso2, M. Kuepferling2, and C. P. Sasso2

1SATIE, ENS de Cachan, CNRS, UniverSud, 61 av du President Wilson, F-94230 Cachan, France
2Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, 10135 Torino, Italy

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(Received 20 September 2011; accepted 5 October 2011; published online 6 February 2012)

We report on the magnetic field induced isothermal entropy change, Δs(Ha, T), of W-type ferrite with CoZn substitution. Entropy measurements are performed by direct calorimetry. Single crystals of the composition BaCo0.62Zn1.38Fe16O27, prepared by the flux method, are measured at different fixed temperatures under an applied field perpendicular and parallel to the c axis. At 296 K one deduces a value of K1 = 8.7 × 104  J m−3 for the first anisotropy constant, which is in good agreement with the literature. The spin reorientation transition temperature is estimated to take place between 200 and 220 K.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENT
  3. ANALYSIS AND DISCUSSION

KEYWORDS, PACS, and IPC

Keywords

barium compounds, calorimetry, cobalt compounds, crystal growth from solution, ferrites, magnetic anisotropy, spin dynamics, zinc compounds

PACS

International Patent Classification (IPC)

  • B01D9/00

    Crystallisation

  • C30B7/00

    Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions

  • 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/10.1063/1.3670062

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. Basso, C. P. Sasso, M. Kuepferling, K. Skokov, and O. Gutfleisch, J. Appl. Phys. 109, 083910 (2011)JAPIAU000109000008083910000001.

    A. Paoluzi, F. Licci, O. Moze, G. Turilli, A. Deriu, G. Albanese, and E. Calabrese, J. Appl. Phys. 63, 5074 (1988)JAPIAU000063000010005074000001.

    V. Basso, C. P. Sasso, and M. Kupferling, Rev. Sci. Instrum. 81, 113904 (2010)RSINAK000081000011113904000001.


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