Anisotropy transition of Co in IrMn/Co/FeO x /Co by field cooling

Chih Ta Shen, Chih Huang Lai*, Po Hsiang Huang, Shih-ying Hsu, Ting Yi Chung

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The temperature dependence of Co anisotropy on a nano- Fe Ox layer was studied in the structure of IrMnCo (FM1) Fe Ox Co (FM2). An anisotropy transition of the FM2 was observed from a combination of uniaxial and unidirectional anisotropies at room temperature (RT) to unidirectional anisotropy at temperature below 80 K through field cooling process. Various ferromagnetic (FM) and antiferromagnetic (AFM) components existing in the Fe Ox layer were attributable to the observed anisotropy of FM2. AFM domains with TN higher than room temperature were responsible for the observed uniaxial anisotropy at RT and AFM domains with TN of 80 K were accountable for the anisotropy transition, below which the unidirectional anisotropy became dominant. In addition, the direction of the shifted loop could be determined by the cooling field direction.

Original languageEnglish
Article number08C910
JournalJournal of Applied Physics
Volume99
Issue number8
DOIs
StatePublished - 25 May 2006

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