Angular dependence of tunneling magnetoresistance in hybrid Fe/GaAlAs/GaMnAs magnetic tunnel junctions

Seonghoon Choi, Taehee Yoo, Seul Ki Bac, Hakjoon Lee, Sangyeop Lee, Sang Hoon Lee, X. Liu, J. K. Furdyna

Research output: Contribution to journalArticle

Abstract

Tunneling magnetoresistance (TMR) phenomena in hybrid Fe/GaAlAs/GaMnAs magnetic tunnel junctions (MTJs) were investigated by rotating a magnetic field of constant strength in the film plane. When a strong field (e.g., 4000 G) is used, the magnetization in GaMnAs and Fe coherently rotates in both layers, resulting in a smooth angular dependence of TMR. In contrast, abrupt transition steps and plateaus are observed in TMR, when a weak field (below 100 G) is rotated. The behavior observed in strong fields is ascribed to tunneling anisotropic magnetoresistance, an effect that occurs when magnetizations in both magnetic layers in the MTJ are aligned parallel to each other. The tunneling behavior observed in weak fields, on the other hand, is caused by differences in relative magnetization alignments in the two layers that arise from differences in their magnetocrystalline anisotropies. The latter behavior provided the anisotropic TMR that involved with parallel and antiparallel alignments at specific crystallographic directions.

Original languageEnglish
Article number7393583
JournalIEEE Transactions on Magnetics
Volume52
Issue number7
DOIs
Publication statusPublished - 2016 Jul 1

Keywords

  • anisotropic tunneling magnetoresistance
  • Magnetic tunnel junction
  • tunneling anisotropic magnetoresistance

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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