Tunable ferromagnetic and antiferromagnetic interfacial exchange coupling in perpendicularly magnetized L10-MnGa/Co2FeAl Heusler bilayers

Q. L. Ma, S. Mizukami, X. M. Zhang, T. Miyazaki

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

In this work, we report a tailorable exchange coupling (Jex) at the Mn62Ga38/Co2FeAl interface, where Mn62Ga38 and Co2FeAl alloys are tetragonal Heusler alloy with high perpendicular magnetic anisotropy and typical cubic Heusler alloy with soft magnetism, respectively. As the post annealing temperature (Ta) is lower than 375 °C, the Jex is ferromagnetic with strength controllable from 7.5 to 0.5 erg/cm2. Interestingly, as Ta increases higher than 400 °C, an antiferromagnetic Jex of -5.5 erg/cm2 is observed. The ferromagnetic/antiferromagnetic transition is further evidenced by the spin dependent transport property of the magnetic tunnel junctions with Mn62Ga38/Co2FeAl as electrode. Based on structure characterization, the variation of Jex during annealing is discussed.

Original languageEnglish
Article number233904
JournalJournal of Applied Physics
Volume116
Issue number23
DOIs
Publication statusPublished - 2014 Dec 21

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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