Antiferromagnet thickness dependence and rotatable spins in exchange biased CoO/Fe films

Greene, Peter K.; Hu, Yong; Qiu, Ziqiang; Liu, Kai

doi:10.1016/j.jmmm.2022.169898

Antiferromagnet thickness dependence and rotatable spins in exchange biased CoO/Fe films

Journal Article · Tue Sep 06 00:00:00 EDT 2022 · Journal of Magnetism and Magnetic Materials

DOI:https://doi.org/10.1016/j.jmmm.2022.169898· OSTI ID:2422579

Greene, Peter K. ^[1]; Hu, Yong ^[2]; Qiu, Ziqiang ^[3]; ^[4]

University of California, Davis, CA (United States)
University of California, Davis, CA (United States); Northeastern University, Shenyang (China)
University of California, Berkeley, CA (United States)
University of California, Davis, CA (United States); Georgetown University, Washington, DC (United States)

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 magnetization 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. Furthermore, 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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2422579

Journal Information:: Journal of Magnetism and Magnetic Materials, Journal Name: Journal of Magnetism and Magnetic Materials Journal Issue: C Vol. 563; ISSN 0304-8853

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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