Disorder-driven hysteresis-loop criticality in Co/CoO-films.
Conference
·
OSTI ID:768582
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{sub c}, we observe a discontinuous magnetization reversal, whereas smooth magnetization loops occur for T < T{sub c}. Our measurements establish the existence of a disorder-driven critical point in the non-equilibrium phase diagram. In addition, we observe scaling behavior in the vicinity of the critical point and determine the critical exponents to {beta} = 0.022 {+-} 0.006 and {beta}{delta} = 0.30 {+-} 0.03.
- Research Organization:
- Argonne National Lab., IL (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 768582
- Report Number(s):
- ANL/MSD/CP-102423; TRN: AH200123%%271
- Resource Relation:
- Conference: 8th Joint Magnetism and Magnetic Materials - INTERMAG Conference, San Antonio, TX (US), 01/07/2001--01/11/2001; Other Information: PBD: 1 Nov 2000
- Country of Publication:
- United States
- Language:
- English
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