Temperature dependence of the domain wall mobility in YIG, deduced from the frequency spectra of the initial susceptibility of polycrystals
The Döring's equation of motion of a 180°-domain wall, when adapted to the case of pinned domain walls as in polycrystalline materials, leads to a 1 / D 2 dependence of the relaxation frequency of domain walls, which has already been observed. Mobility and damping parameters can then be deduced...
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| Published in | Journal of magnetism and magnetic materials Vol. 27; no. 2; pp. 202 - 208 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.01.1982
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| Online Access | Get full text |
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| Summary: | The Döring's equation of motion of a 180°-domain wall, when adapted to the case of pinned domain walls as in polycrystalline materials, leads to a 1 /
D
2 dependence of the relaxation frequency of domain walls, which has already been observed. Mobility and damping parameters can then be deduced from the frequency spectrum of initial susceptibility. The domain wall mobility value obtained by using such a method on polycrystalline YIG samples at RT (1500 cm/s Oe) agrees with recent determinations (2000 to 3000 cm/s Oe) which use pulse field measurements on picture frame single crystals or optical measurements on thin films. The method is applied for temperature measurements; a proportionality between the experimental and the theoretical temperature dependence of the damping parameter and the mobility is obtained from RT up to
T
c, which is discussed taking into account the different parameters involved. |
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| ISSN: | 0304-8853 |
| DOI: | 10.1016/0304-8853(82)90273-6 |