Disorder-driven hysteresis-loop criticality in Co/CoO films

A. Berger; A. Inomata; J. S. Jiang; J. E. Pearson; S. D. Bader; Karin Dahmen

doi:10.1063/1.1361272

Disorder-driven hysteresis-loop criticality in Co/CoO films

A. Berger, A. Inomata, J. S. Jiang, J. E. Pearson, S. D. Bader, Karin Dahmen

Research output: Contribution to journal › Conference article › peer-review

Abstract

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 T_c, we observe a discontinuous magnetization reversal, whereas smooth magnetization loops occur for T<T_c. 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.

Original language	English (US)
Pages (from-to)	7466-7468
Number of pages	3
Journal	Journal of Applied Physics
Volume	89
Issue number	11 II
DOIs	https://doi.org/10.1063/1.1361272
State	Published - Jun 1 2001
Event	8th Joint Magnetism and Magnetic Materials-Intermag Conference - San Antonio, TX, United States Duration: Jan 7 2001 → Jan 11 2001

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General Physics and Astronomy

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10.1063/1.1361272

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title = "Disorder-driven hysteresis-loop criticality in Co/CoO films",

abstract = "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 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.",

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AU - Berger, A.

AU - Inomata, A.

AU - Jiang, J. S.

AU - Pearson, J. E.

AU - Bader, S. D.

AU - Dahmen, Karin

PY - 2001/6/1

Y1 - 2001/6/1

N2 - 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 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.

AB - 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 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.

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JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 11 II

T2 - 8th Joint Magnetism and Magnetic Materials-Intermag Conference

Y2 - 7 January 2001 through 11 January 2001

ER -

Disorder-driven hysteresis-loop criticality in Co/CoO films

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