Exchange Coupling Nanophase Fe-Pd Ferromagnets Through Solid State Transformation

Kathleen N. Shugart; Gerard M. Ludtka; Gail Mackiewicz-Ludtka; William A. Soffa

doi:10.4028/www.scientific.net/SSP.172-174.273

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HomeSolid State PhenomenaSolid State Phenomena Vols. 172-174Exchange Coupling Nanophase Fe-Pd Ferromagnets...

Exchange Coupling Nanophase Fe-Pd Ferromagnets Through Solid State Transformation

Abstract:

This study continues previous work on off-stoichiometric Fe-Pd alloys using a combined reaction strategy during thermomechanical processing [1,2]. Severe plastic deformation of the initial disordered fcc gamma phase (γ) of compostion Fe-35at.%Pd, followed by heat treatment in the two phase field produces a nano-composite ferromagnet comprised of soft alpha phase/ferrite (α) in a high-anisotropy L1₀ FePd matrix. The length scale and morphology of the transformation products have been characterized using x-ray diffraction, and scanning electron microscopy. The transformed microstructures exhibit strong texture retention similar to the stoichiometric alloy suggesting a massive ordering mode. The alloy has shown a proclivity to exchange couple at a length scale not in agreement with proposed theories of exchange coupling [3,4]. The magnetic properties were measured using standard vibrating sample magnetometry (VSM). This research has been supported by the National Science Foundation (NSF-DMR).

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Periodical:

Solid State Phenomena (Volumes 172-174)

Pages:

273-278

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.172-174.273

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Online since:

June 2011

Authors:

Kathleen N. Shugart, Gerard M. Ludtka, Gail Mackiewicz-Ludtka, William A. Soffa

Keywords:

Combined Reactions, Exchange Coupling, L1₀ Ferromagnets, Nanocomposite

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