Ultrasound induced irreversible changes in the magnetization of highly magnetostrictive materials Tb0.27Dy0.73Fe2and MnBi
作者:
Calvin Winter,
A. S. Arrott,
期刊:
Journal of Applied Physics
(AIP Available online 1982)
卷期:
Volume 53,
issue 3
页码: 2733-2735
ISSN:0021-8979
年代: 1982
DOI:10.1063/1.330950
出版商: AIP
数据来源: AIP
摘要:
A sample, after being saturated in a high magnetic field, is in an unstable remanent state in a low or reversed magnetic field. Application of a burst of ultrasound at this point will result in an irreversible decrease in the remanent magnetization. By subsequently changing the magnetic field, and applying a second burst of ultrasound, a reduced irreversible decrease is effected. This observed behavior is a measure of the statistical correlation between the two magnetic states of the sample. We have successfully described this behavior with a modified Preisach model. We have observed irreversible changes in the magnetization of Tb0.27Dy0.73Fe2(&lgr;111= 1.6×10−3) as large as 50% of the remanent magnetization, or 0.4% of the saturation magnetization, induced by ultrasound bursts of 107dyne/cm2at 20 °C. In MnBi (&lgr;s= −8×10−4) crystals in Bi, irreversible effects as large as 1.8% of the remanent magnetization, or 0.6% of the saturation magnetization, have been observed at 120 K.
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