Statistical fluctuations during magnetization reversal in Fe films

Puppin, E.; Ricci, S.

doi:10.1109/20.908691

Cited by 6 publications

(15 citation statements)

References 4 publications

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“…Previous experimental work on 2D systems has produced different values, ranging from being ϳ1.5, 14 to ϳ1.1. 15 Our results are close to the lower of the two, although the authors offer no explanation as to the physical meaning of their value, so it is difficult to know whether the causes are the same in each case.…”

Section: Resultssupporting

confidence: 50%

“…However, comparatively little work has been done with twodimensional samples, as a pickup coil receives a greatly decreased signal, making it difficult to resolve against background noise. Accordingly, although the inductive method has been employed in this area successfully by one group, 14 most experiments in this area have been based on different techniques, such as MOKE 15,16 and MFM. 17 With the exception of Ref.…”

Section: Introductionmentioning

confidence: 99%

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Barkhausen statistics from a single domain wall in thin films studied with ballistic Hall magnetometry

Christian

Новоселов

2006

Phys. Rev. B

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The movement of a micron-size section of an individual domain wall in a uniaxial garnet film was studied using ballistic Hall micromagnetometry. The wall propagated in characteristic Barkhausen jumps, with the distribution in jump size S, following the power-law relation, D͑S͒ ϰ S −. In addition to reporting on the suitability of employing this alternative technique, we discuss the measurements taken of the scaling exponent , for a single domain wall in a two-dimensional sample with magnetization perpendicular to the surface, and low pinning center concentration. This exponent was found to be 1.14± 0.05 at both liquid helium and liquid nitrogen temperatures.

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Section: Resultssupporting

confidence: 50%

Section: Introductionmentioning

confidence: 99%

Barkhausen statistics from a single domain wall in thin films studied with ballistic Hall magnetometry

Christian

Новоселов

2006

Phys. Rev. B

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“…For ferromagnetic thin films, very important for nanostructured magnetic devices, the interpretation of the statistical properties is not so well established, due to several theoretical and experimental difficulties, even considering the recent relevant reports found in literature [19][20][21][22][23][24][25][26][27][28][29]. On the theoretical side, the complexity of the magnetic domains and variety of DWs in films make the complete description of the system and the analysis of the dynamics a hard task [30,31].…”

Section: Introductionmentioning

confidence: 99%

Universal properties of magnetization dynamics in polycrystalline ferromagnetic films

et al. 2013

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We investigate the scaling behavior in the statistical properties of Barkhausen noise in ferromagnetic films. We apply the statistical treatment usually employed for bulk materials in experimental Barkhausen noise time series measured with the traditional inductive technique in polycrystalline ferromagnetic films having different thickness from 100 to 1000 nm and determine the scaling exponents. Based on this procedure, we group the samples in a single universality class, since the scaling behavior of Barkhausen avalanches is characterized by exponents τ∼1.5, α∼2.0, and 1/σνz∼ϑ∼2.0 for all the films. We interpret these results in terms of theoretical models and provide experimental evidence that a well-known mean-field model for the dynamics of a ferromagnetic domain wall in three-dimensional ferromagnets can be extended for films. We identify that the films present an universal three-dimensional magnetization dynamics, governed by long-range dipolar interactions, even at the smallest thicknesses, indicating that the two-dimensional magnetic behavior commonly verified for films cannot be generalized for all thickness ranges.

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“…Considering these reports found in literature based on magneto-optical measurements [42][43][44][45][46][47][48][49][50][51][52], although they restrict the analysis to distributions of jump sizes, when compared to theoretical predictions, most of them does confirm an essentially two-dimensional magnetic behavior for films, as expected due to reduced thickness of the studied samples.…”

Section: Introductionmentioning

confidence: 99%

“…Experimentally, several interesting results have been obtained for different ferromagnetic films through both magneto-optical [42][43][44][45][46][47][48][49][50][51][52] and inductive [6,8,53] [44], both results obtained through measurements performed using a magneto-optical elipsometer. D.-H. Kim et al [45] have presented τ ∼ 1.33 for Co polycrystalline films, with thicknesses varying from 5 to 50 nm, and S.-C. Shin et al [46] have found τ ∼ 1.33 for Co and MnAs films, with the same thicknesses, by measurements using a magneto-optical microscope magnetometer, capable of observing directly the motion of the DWs and the Barkhausen avalanches [47].…”

Section: Introductionmentioning

confidence: 99%

Statistical properties of Barkhausen noise in amorphous ferromagnetic films

et al. 2014

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We investigate the statistical properties of the Barkhausen noise in amorphous ferromagnetic films with thicknesses in the range between 100 and 1000 nm. From Barkhausen noise time series measured with the traditional inductive technique, we perform a wide statistical analysis and establish the scaling exponents τ , α, 1/σνz, and ϑ. We also focus on the average shape of the avalanches, which gives further indications on the domain wall dynamics. Based on experimental results, we group the amorphous films in a single universality class, characterized by scaling exponents τ ∼ 1.27, α ∼ 1.5, 1/σνz ∼ ϑ ∼ 1.77, values similar to that obtained for several bulk amorphous magnetic materials. Besides, we verify that the avalanche shape depends on the universality class. By considering the theoretical models for the dynamics of a ferromagnetic domain wall driven by an external magnetic field through a disordered medium found in literature, we interpret the results and identify an experimental evidence that these amorphous films, within this thickness range, present a typical three-dimensional magnetic behavior with predominant short-range elastic interactions governing the domain wall dynamics. Moreover, we provide experimental support for the validity of a general scaling form for the average avalanche shape for non-mean-field systems.

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Statistical fluctuations during magnetization reversal in Fe films

Cited by 6 publications

References 4 publications

Barkhausen statistics from a single domain wall in thin films studied with ballistic Hall magnetometry

Barkhausen statistics from a single domain wall in thin films studied with ballistic Hall magnetometry

Universal properties of magnetization dynamics in polycrystalline ferromagnetic films

Statistical properties of Barkhausen noise in amorphous ferromagnetic films

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