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Journal of Applied Physics / Volume 102 / Issue 5 / MAGNETISM AND SUPERCONDUCTIVITY

J. Appl. Phys. 102, 053906 (2007); http://dx.doi.org/10.1063/1.2775877 (5 pages)

Magnetocaloric effect in reactively-milled LaFe11.57Si1.43Hy intermetallic compounds

K. Mandal1, D. Pal1, O. Gutfleisch2, P. Kerschl2, and K.-H. Müller2

1Magnetism Laboratory, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 098, India
2Leibniz Institut für Festkörper- und Werkstoffforschung Dresden (IFW Dresden), Institut für Metallische Werkstoffe, Postfach 270116, 01171 Dresden, Germany

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(Received 3 April 2007; accepted 14 July 2007; published online 11 September 2007)

Hydrides of LaFe11.57Si1.43 intermetallic compound have been prepared by high-energy ball milling in the presence of hydrogen gas, a process known as reactive milling. The Curie temperature of the samples was tuned within the temperature range of 199 K to 346 K by changing the hydrogen content from 0 to 2.3 at. % without compromising much of the magnitude of the magnetocaloric effect. Arrott plots and large hysteresis in the magnetization vs magnetic field curves confirm that the first-order itinerant-electron metamagnetic transition is the reason for large entropy change in the parent as well as in the hydride samples. The present study indicates that reactive milling can be an effective method for incorporating interstitial hydrogen within these compounds in order to raise their TC to room temperature.

© 2007 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENT
  3. RESULTS AND DISCUSSION
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

ball milling, band model of magnetism, Curie temperature, hydrogen, interstitials, iron alloys, lanthanum alloys, magnetic hysteresis, magnetocaloric effects, metamagnetism, silicon alloys

PACS

  • 75.30.Kz

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

  • 75.30.Sg

    Magnetocaloric effect, magnetic cooling

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 75.10.Lp

    Band and itinerant models

  • 81.20.Wk

    Machining, milling

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2775877

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.
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