Anomalous Magnetic Aftereffect

Müller, K.‐H.; Wolf, Manfred; Handstein, A.; Eckert, D.; Andrikidis, C.; Collocott, S.J.

doi:10.1007/978-94-011-5478-9_24

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…2). V a stays almost constant over a certain range on the demagnetization curve around H c (M = 0) and its value in this range (1.7 × 10 -23 m 3 ) is comparable to other reports for M-type hexaferrites [6,7]. On the other hand, V a increases as higher negative fields are approached, as can be observed clearly in Fig.…”

Section: Resultssupporting

confidence: 89%

“…The experimental logarithmic time dependence of magnetization observed on a wide range of materials is well established as arising from a broad energy barrier distribution [1]. However non-logarithmic time dependencies of magnetization [2][3][4] are often also reported, most related to measurements performed on recoil curves and in two-phase (hard/soft) magnetic samples.…”

Section: Introductionmentioning

confidence: 97%

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Magnetic viscosity and activation volume in chromium substituted Pb–M hexaferrite

Faloh-Gandarilla

Castañón

Leccabue

2005

Physica Status Solidi (b)

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PACS 75.50.Gg, 75.60.Lr PbFe 11 CrO 19 polycrystalline samples were prepared by the chemical coprecipitation method. X-ray diffraction and Mössbauer spectroscopy confirm the formation of the M-type hexagonal structure. Time dependence of the magnetization was recorded on the demagnetization curve of the hysteresis loop. It is well described by a simple logarithmic law but also non-logarithmic behavior was detected. A two-peak dependence of the viscosity coefficient S with the applied field was encountered. Considering reversible susceptibility measurements and a M(H) curve at constant dM/dt in the irreversible susceptibility determination, the calculated activation volume as a function of the applied field shows two well defined zones. The zones observed in the activation volumes are related to the two local maxima that the total susceptibility exhibits. It points to the fact that the viscosity study is sensible enough to characterize this system, encountering two apparent activation volumes.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 97%

Magnetic viscosity and activation volume in chromium substituted Pb–M hexaferrite

Faloh-Gandarilla

Castañón

Leccabue

2005

Physica Status Solidi (b)

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“…When the magnetization can increase instead of decreasing, and in certain cases nonmonotonic behavior can be observed [1], [2]. This effect can be pronounced for two-phase exchange-coupled spring magnets [1]. To our knowledge, however, nonmonotonic relaxation has not been observed in recording type media at zero field; that is, when .…”

Section: Introductionmentioning

confidence: 78%

“…Anomalous viscosity effects have been reported when the field history is more complex, such as applying a saturating field, a reverse field followed by a different reverse field [1]- [3]. When the magnetization can increase instead of decreasing, and in certain cases nonmonotonic behavior can be observed [1], [2]. This effect can be pronounced for two-phase exchange-coupled spring magnets [1].…”

Section: Introductionmentioning

confidence: 96%

Zero field viscosity in magnetic thin films and tapes

2001

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We have measured the relaxation of the remanent magnetization in a number of granular thin films in which delta-M measurements suggest the presence of exchange coupling. The relaxation measurements were made at zero field after application of a saturation field followed by a reverse field. The films had varying compositions (CoPtCrB, Co/CN, CoPt/SiO 2 ) and had thermal stability factors, B , ranging from 29 to 670. The most general behavior of the zero field relaxation, observed for the smaller thermal stability factors, was an initial increase in the remanent magnetization followed by a decrease at longer times. The maximum initial zero field viscosity is strongly correlated with the inverse thermal stability factor, B, and generally increases with the area under delta-M curve, normalized by the remanent coercivity. A small zero field relaxation was also observed in barium ferrite and CrO 2 tapes.Index Terms-Thermal stability and interactions in magnetic recording media, thin and granular films.

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Magnetization Curves

Bertotti

1998

Hysteresis in Magnetism

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Anomalous Magnetic Aftereffect

Cited by 7 publications

References 24 publications

Magnetic viscosity and activation volume in chromium substituted Pb–M hexaferrite

Magnetic viscosity and activation volume in chromium substituted Pb–M hexaferrite

Zero field viscosity in magnetic thin films and tapes

Magnetization Curves

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