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Disorder-driven hysteresis-loop criticality in Co/CoO films (2001)

Berger, A. ; Inomata, A. ; Jiang, J. S. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 89 (2001), S. 7466-7468

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The effect of magnetic disorder on the magnetization reversal process in thin Co/CoO films has been investigated. The antiferromagnetic CoO layer allows a reversible tuning of the magnetic disorder by simple temperature variation. For temperatures above a critical temperature Tc, we observe a discontinuous magnetization reversal, whereas smooth magnetization loops occur for T〈Tc. Our measurements establish the existence of a disorder-driven critical point in the nonequilibrium phase diagram. In addition, we observe scaling behavior in the vicinity of the critical point and determine the critical exponents to β=0.022±0.006 and βδ=0.30±0.03. © 2001 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1361272

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