Applications of micromagnetics

Aharoni, Amilcam

doi:10.1080/10408437108243428

Cited by 32 publications

(7 citation statements)

References 191 publications

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“…According to our observations, the magnetic dislocation nucleation process proceeds as follows: a nucleus of an inverse phase is formed, it grows and becomes a shortened domain, and we describe its movement as the motion of an MD. The inverse phase formation process was repeatedly discussed 26 . It was theoretically shown that an inverse phase nucleates in areas of a crystal where anisotropy or exchange energy is lower.…”

Section: Discussionmentioning

confidence: 99%

Motion and Interaction of Magnetic Dislocations in Alternating Magnetic Field

Pamyatnykh

Filippov

Agafonov

et al. 2017

Sci Rep

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The behavior of magnetic dislocations (MDs) in an alternating harmonic magnetic field in iron garnets has been experimentally investigated. The results are presented for single-crystal plates in which the drift of domain walls is observed in fields of sound frequencies. It is found that MDs in a stripe domain structure are able to move not only along but also across domain walls. A pairwise interaction between magnetic dislocations when they approach each other to distances on the order of the sizes of the cores of MDs is revealed. The processes of the annihilation, mutual passing of magnetic dislocations through each other and overtaking are found. The features of the dynamic behavior of MDs are explained using a mechanism based on the presence of vertical Bloch lines in a structure of domain walls. MDs are formed at nucleation centers, and their nucleation field is lower than the drift-starting field, which corresponds to previously proposed dislocational mechanism of the drift. The dependencies of quantitative parameters of the drift and MDs on amplitude and frequency of the pumping field are determined. The behavior of MDs should be considered when analyzing the mechanisms for magnetization and temperature-dependent phase transitions in magnetic layers.

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Section: Discussionmentioning

confidence: 99%

Motion and Interaction of Magnetic Dislocations in Alternating Magnetic Field

Pamyatnykh

Filippov

Agafonov

et al. 2017

Sci Rep

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“…Clearly, a precise theory of relaxation of remanence in MD grains must take into account all of the above factors, which in micromagnetic theory are often oversimplified and collectively modeRed by local variations in the magnetocrystalline energy (for example, see review by Aharoni [1971]). Fortunately, we are only attempting to explain first-order effects here, particularly why larger MD grains are less stable than smaller ones.…”

Section: Domain Walls Interact With Internal Defects In a Crystal In mentioning

confidence: 99%

Toward a better theory of thermal remanent magnetization

Merrill¹

1981

J. Geophys. Res.

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The major results of this paper are the pointing out of deficiencies in existing thermal remanent magnetization theories for nonuniformly magnetized grains and the suggestion of ways in which some of these deficiencies might be removed. Most models of pseudo single domain behavior fail to predict certain critical experimental observations of TRM, particularly those dealing with magnetic stability. At least part of the problem with understanding TRM in small nonuniformly magnetized grains is that the size and role of the demagnetization field has been grossly overestimated. TRM in small multidomain grains is probably acquired by domain wall movement, except for the smallest (submicron) grains in which pseudo single domain behavior associated with wall moments probably dominates. A collective response of domain walls seems to be required to explain magnetic stability observations, although the degree and the precise nature of this collective response has not yet been determined.

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“…Another ac type instrumentation is described by Grambow and Weber (87) for measurements in the 2 MHz to 1 GHZ region. Applications to the zero field spin-spin relaxation of ceriumand neodymium magnetisium nitrate at 4.2 °K are discussed.…”

Section: Instrumentationmentioning

confidence: 99%

“…Aharoni (1) has surveyed applications of micromagnetics, with special reference to the recent advances in calculating various details of the hysteresis curves of ferromagnetic materials. The scope has been extended to cover almost all theories which use the concept of the magnetization vector as a continuous function of space, but an effort has been made to choose theories which are applicable to more than one special case and to avoid crude approximations or trivial extensions of previous calculations.…”

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confidence: 99%