期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 563, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2022.169898
关键词
Exchange bias; First order reversal curve; Monte Carlo simulations
资金
- NSF [DMR-1610060, DMR-2005108]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-05CH11231]
- van der Waals heterostructures program [KCWF16]
The emergence of exchange bias and coercivity enhancement in epitaxial CoO/Fe films is investigated, revealing different CoO thickness dependence of the effects. It is found that the AF domain state is metastable and can be reoriented by external and exchange fields prior to the appearance of frozen spins. Monte Carlo simulations show that AF anisotropy energy barrier and rotatable spins induced by magnetic field and exchange interaction account for the observed effects.
The emergence of exchange bias and coercivity enhancement has been investigated in epitaxial CoO/Fe films with varied antiferromagnet (AF) thicknesses, even smaller than the critical value where the frozen CoO spins are detectable. Vector magnetometry and first-order reversal curve (FORC) measurements reveal different CoO thickness dependence of the exchange bias and coercivity enhancement, including the evolution of magnetiza-tion reversal from a high coercivity, low bias phase due to rotatable CoO moments to a high bias, low coercivity phase due to frozen CoO moments. The AF domain state is found to be metastable, which can be reoriented by external and exchange fields prior to the appearance of frozen spins, pointing to a generic origin of the training effect. Monte Carlo simulations show that the AF anisotropy energy barrier and the rotatable spins induced by magnetic field and exchange interaction at the interface are responsible for the observed effects.
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