O'Grady, K., Holloway, L. and Antel, W.J. (2002) Measurement of the energy barrier distribution in the antiferromagnetic layer of exchange-biased materials. IEEE Transactions on Magnetics. pp. 2741-2743. ISSN 1941-0069
The value of exchange field of two FeMn–NiFeCobased spin valves with varying thickness of the pinned ferromagnetic layer has been determined as a function of temperature. The complexities caused by thermal activation of the antiferromagnet during measurement have been overcome by the development of a measurement protocol. The values of the exchange field obtained provide a measure of the degree of order in the antiferromagnet. Thus it is possible to determine the distribution of energy barriers to reversal for the system. We find that for a 110-A -thick pinned NiFeCo layer a broad distribution exists, whereas for an 80-A layer, the distribution is bimodal and has a component subject to thermal activation at temperatures down to 260 K.
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|Institution:||The University of York|
|Academic Units:||The University of York > Physics (York)|
|Depositing User:||Sherpa Assistant|
|Date Deposited:||16 Sep 2005|
|Last Modified:||06 Feb 2017 11:43|