Determination of rotatable and frozen CoO spins and their relationship to exchange bias in CoO/Fe/Ag(001)

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The exchange bias of epitaxially grown CoO/Fe/Ag(001) was investigated using X-ray Magnetic Circular Dichroism (XMCD) and X-ray Magnetic Linear Dichroism (XMLD) techniques. A direct XMLD measurement on the CoO layer during the Fe magnetization reversal shows that the CoO compensated spins are rotatable at thinner thickness and frozen, i.e. fixed in direction to the lattice, at larger thickness. By a quantitative determination of the rotatable and frozen CoO spins as a function of the CoO film thickness, we find the remarkable result that the exchange bias is well established before frozen spins are detectable in the CoO film, contrary to ... continued below

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Wu, J.; Park, J.; Kim, W.; Arenholz, E.; Liberati, M.; Scholl, A. et al. February 10, 2010.

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The exchange bias of epitaxially grown CoO/Fe/Ag(001) was investigated using X-ray Magnetic Circular Dichroism (XMCD) and X-ray Magnetic Linear Dichroism (XMLD) techniques. A direct XMLD measurement on the CoO layer during the Fe magnetization reversal shows that the CoO compensated spins are rotatable at thinner thickness and frozen, i.e. fixed in direction to the lattice, at larger thickness. By a quantitative determination of the rotatable and frozen CoO spins as a function of the CoO film thickness, we find the remarkable result that the exchange bias is well established before frozen spins are detectable in the CoO film, contrary to the common assumption that the majority of antiferromagnetic spins need to be frozen to generate the exchange bias. We further show that the rotatable/frozen CoO spins are uniformly distributed in the CoO film.

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  • Journal Name: Physical Review Letters

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  • Report No.: LBNL-3440E
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1103/PhysRevLett.104.217204 | External Link
  • Office of Scientific & Technical Information Report Number: 983290
  • Archival Resource Key: ark:/67531/metadc1013757

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  • February 10, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 17, 2017, 8:10 p.m.

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Wu, J.; Park, J.; Kim, W.; Arenholz, E.; Liberati, M.; Scholl, A. et al. Determination of rotatable and frozen CoO spins and their relationship to exchange bias in CoO/Fe/Ag(001), article, February 10, 2010; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1013757/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.