NDLI: Thermally activated motion of a 180° Bloch wall in a Fe-Si single crystal

Content Provider	IEEE Xplore Digital Library
Author	Ferrari, G. Porteseil, J. Vergne, R.
Copyright Year	1965
Abstract	The activated motion of a 180° Bloch wall is investigated in a frame-shaped Fe-Si single crystal. Two kinds of behaviour can be observed. In one of them, the irreversible motion of the wall takes place in a small scale by localized, independent jumps. When a constant magnetic field is applied, the jumps can be thermally activated and the induction increases. The temperature dependence of the change of induction is consistent with a spectrum of energy barriers and can be interpreted by the activation model of Street and Woolley. The order of magnitude of the energy barriers is 1000 K. The magnetic after-effect recorded on a small-amplitude hysteresis loop is proportional to the irreversible susceptibility. The wall motion can also take place by large, collective jumps. The after-effect then exhibits an exponential time dependence which reflects a single energy barrier (∼ 7000 K). When the sample is cycled, the losses per cycle are frequency dependent ; a logarithmic deviation from the linear law is observed at low frequencies, showing that thermal fluctuation assists wall motion. A good agreement is found with experiments previously reported by Sasaki on commercial Fe-Si.
Sponsorship	IEEE Magnetics Society
Starting Page	764
Ending Page	766
Page Count	3
File Size	285477
File Format	PDF
ISSN	00189464
Volume Number	14
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1978-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic fields Magnetic hysteresis Energy barrier Optical recording Temperature dependence Magnetic susceptibility Frequency dependence Fluctuations Crystalline materials Magnetic materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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