Barkhausen effect in magnetic thin films: General behaviour and stationarity along the hysteresis loop

Wiegman, N. J.; Stege, R. ter

doi:10.1007/bf00930382

Cited by 13 publications

(6 citation statements)

References 10 publications

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“…A selected number of results had been previously reported in a couple of papers. 2,3 The typical noise picture in these thin films is similar to the one reported in Fig. 1.…”

Section: Barkhausen Noisementioning

confidence: 51%

“…[1][2][3][4][5] We need to analyze them in detail because they represent a fundamental basis for further investigations, and because they also show all the difficulties to interpret the data. The Ph.D thesis of N.J. Wiegman in 1979 1 investigated the noise properties of Permalloy thin films with variable thicknesses, using an inductive setup.…”

Section: Barkhausen Noisementioning

confidence: 99%

“…the Barkhausen noise), it is remarkable that only a few number of experimental papers [1][2][3][4][5] have considered so far the properties of the noise in two dimensional systems, i.e. in thin magnetic films.…”

Section: Introductionmentioning

confidence: 99%

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Two dimensional models for Barkhausen noise

Durin

Zapperi

2005

SPIE Proceedings

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We analyze the current experimental and theoretical research about the magnetization (Barkhausen) noise in magnetic thin films. We observe that, in respect to three-dimensional systems, the situation is much more complicated, and many details still have to be analyzed and understood. In particular, the critical exponents must be correctly analyzed when compared with the theoretical predictions. We observe, for instance, that the measured magnetization steps in optical measurements do not actually correspond to the avalanche size, as claimed, but to a different quantity having a different critical exponent. We also observe as the lack of a significative demagnetizing field does not assure to have a stationary Barkhausen signal, which again implies a different set of exponents. For comparison, we report in detail all the possible theoretical values of the critical exponents calculated for a single DW model.

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“…A selected number of results had been previously reported in a couple of papers. 2,3 The typical noise picture in these thin films is similar to the one reported in Fig. 1.…”

Section: Barkhausen Noisementioning

confidence: 51%

Section: Barkhausen Noisementioning

confidence: 99%

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Two dimensional models for Barkhausen noise

Durin

Zapperi

2005

SPIE Proceedings

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“…In three-dimensional bulk ferromagnetic materials, the scaling behavior of the Barkhausen effect is understood theoretically in terms of the depinning transition of domain walls [3] with two distinct universality classes for amorphous and polycrystalline materials [4]. A similar clear-cut classification does not exist in lower dimensions, despite Barkhausen avalanches having been studied experimentally for decades in several ferromagnetic thin films with in-plane [5][6][7][8][9][10] or out-of-plane anisotropy [11,12]. This issue is particularly important because these lowdimensional magnetic structures have become increasingly relevant for various technological applications [13,14].…”

Section: Introductionmentioning

confidence: 99%

Universality classes and crossover scaling of Barkhausen noise in thin films

2014

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We study the dynamics of head-to-head domain walls separating in-plane domains in a disordered ferromagnetic thin film. The competition between the domain-wall surface tension and dipolar interactions induces a crossover between a rough domain-wall phase at short length scales and a large-scale phase where the walls display a zigzag morphology. The two phases are characterized by different critical exponents for Barkhausen avalanche dynamics that are in quantitative agreement with experimental measurements on MnAs thin films.

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“…The BN in thin films has been investigated to a lower extent, because of the technical difficulties 5 consequent to the small amount of magnetic material involved. However, the relevance of the BN in small magnetic structures is becoming a relevant technological issue due to the progresses in magnetoelectronics, recording heads, 6,7 and magnetoresistive devices.…”

Section: Introductionmentioning

confidence: 99%

Barkhausen noise and size effects in magnetic microstructures

Callegaro¹,

Puppin

Ricci

2001

Journal of Applied Physics

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The properties of the Barkhausen noise in a series of permalloy squares have been measured with a magneto-optical hysteresigraph. The magnetic structures have been litographically defined in a permalloy film ͑thickness 160 nm͒ as squares having a size from 20 to 320 m. The statistical distributions of the most significant parameters of the Barkhausen jumps have been extracted from the original data. At variance with respect to bulk and thin films, the jump amplitude distribution does not follow a well-defined power-law behavior. This observation is explained in terms of a transition between a discrete magnetization regime typical of small magnetic structures and the more usual regime observed in extended samples.

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Barkhausen effect in magnetic thin films: General behaviour and stationarity along the hysteresis loop

Cited by 13 publications

References 10 publications

Two dimensional models for Barkhausen noise

Two dimensional models for Barkhausen noise

Universality classes and crossover scaling of Barkhausen noise in thin films

Barkhausen noise and size effects in magnetic microstructures

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