Temperature dependence of magnetic anisotropy for single domain L10 FePd crystal and role of the ordering defects

A. Korolev, N. Vlasova, O. Golovina, S. Okatov, J. Barker, B. Greenberg, O. Klementjeva, A. Volkov, O. N. Mryasov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The ordered alloys of Fe with nominally non-magnetic 4d/5d (Rh, Pd, Pt) elements demonstrate an array of an attractive magnetic properties. The high magnetic anisotropy energy (MAE) of the ordered L10 FePt is considered as particularly important property for achieving small thermally stable magnetic grains [1]. Recent progress in fabrication and characterization of nano-granular and nano-particulate FePt films puts emphasize on understanding of the temperature dependence of MAE [2]. Theoretical framework for the temperature dependence of the MAE was summarized by Callen and Callen [3]. This theory predicts universal parametric dependence between K1(T) and MS(T) which for the uniaxial magnet simply given by the K1(MS(T)) ∼ MS3 in the low temperature region. Measurements on epitaxial FePt films, however, demonstrate K(T) ∼ MS2 scaling in the wide temperature range [2]. The origin of this behavior was found to be in the magnetic interactions mediated by the Pt induced spin moment [4]. In FePt anisotropic exchange mediated by the induced Pt spin moment appears to be dominating over the Fe contribution and thus leading to the K1 ∼ Ms2.1 low temperature scaling behavior [4]. In this work we present results of the magnetic measurements for a single variant highly ordered L10 FePd crystals. This chemical analog of the FePt is known for its significantly lower ordering temperature (950 vs. 1910 K) and somewhat smaller MAE K1 of about 2'107 erg/cc. We present results of K1(T) measurements on single ordering domain FePd samples which clearly demonstrate different than reported for the FePt thin films scaling behavior K(T) ∼ M3.8. We discuss initial theoretical interpretation provided on the basis of recently measured ordering defects in the form of intermediate disordered phase [5,6].

Original languageEnglish
Title of host publication2015 IEEE International Magnetics Conference, INTERMAG 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479973224
DOIs
Publication statusPublished - 2015 Jul 14
Event2015 IEEE International Magnetics Conference, INTERMAG 2015 - Beijing, China
Duration: 2015 May 112015 May 15

Publication series

Name2015 IEEE International Magnetics Conference, INTERMAG 2015

Other

Other2015 IEEE International Magnetics Conference, INTERMAG 2015
CountryChina
CityBeijing
Period15/5/1115/5/15

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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