The probability distribution of the amplitude DeltaM of Barkhausen jumps during magnetization reversal in thin films can be measured with optical techniques since each jump produces a variation DeltaI of the laser beam intensity used to probe magnetization. Here we present a theoretical model which demonstrates that no distortion takes place if P(DeltaM) is a power law P(DeltaM)=DeltaM^(-alpha) with alpha >= 1.0. This prediction has been experimentally confirmed by measuring P(DeltaI) in the same experimental conditions but in two different ways: first with a Gaussian and then with a constant intensity laser profile. In both cases the same power-law distribution has been observed with alpha=1.

Magneto-optical Kerr effect (MOKE) measurements with uniform laser profiles

PUPPIN, EZIO;BRENNA, MASSIMILIANO;PINOTTI, ERMANNO;VALENTINI, GIANLUCA;CUBEDDU, RINALDO
2007

Abstract

The probability distribution of the amplitude DeltaM of Barkhausen jumps during magnetization reversal in thin films can be measured with optical techniques since each jump produces a variation DeltaI of the laser beam intensity used to probe magnetization. Here we present a theoretical model which demonstrates that no distortion takes place if P(DeltaM) is a power law P(DeltaM)=DeltaM^(-alpha) with alpha >= 1.0. This prediction has been experimentally confirmed by measuring P(DeltaI) in the same experimental conditions but in two different ways: first with a Gaussian and then with a constant intensity laser profile. In both cases the same power-law distribution has been observed with alpha=1.
optical Kerr effect.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/531038
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