Reproducibility of magnetic avalanches in an Fe-Ni-Co ferromagnet

Journal Article · Fri Dec 01 00:00:00 EST 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.75.4694· OSTI ID:277363

Urbach, J S; Madison, R C; Markert, J T ^[1]

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1. Center for Nonlinear Dynamics and Department of Physics, The University of Texas at Austin, Austin, Texas 78712 (United States)

A study of magnetic avalanches in Perminvar, an Fe-Ni-Co alloy, shows that some avalanches are almost exactly reproducible from one magnetic field cycle to the next, while others show significant variability. Averaging over many cycles produces a fingerprint reflecting the reproducibility of the noise. The fingerprint is not strongly temperature or driving-rate dependent, indicating that the variability is a consequence of dynamical effects. We also find that the slope of the cycle-averaged magnetization, {ital d}{l_angle}{ital M}{r_angle}/{ital dH}, is correlated with the cycle-to-cycle variations in magnetization, {l_angle}({delta}{ital M}){sup 2}{r_angle}. {copyright} {ital 1995 The American Physical Society.}

• OSTI ID: 277363
• Journal Information: Physical Review Letters, Vol. 75, Issue 25; Other Information: PBD: Dec 1995
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT ALLOYS
MAGNETIZATION
IRON ALLOYS
NICKEL ALLOYS
AVALANCHE QUENCHING
DYNAMICS
NOISE
TEMPERATURE DEPENDENCE
TERNARY ALLOY SYSTEMS
BARKHAUSEN EFFECT