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Magnetostriction of a 〈110〉 oriented Tb0.3Dy0.7Fe1.95 polycrystals annealed under a noncoaxial magnetic field

Published online by Cambridge University Press:  14 January 2011

Tianyu Ma ,
Changsheng Zhang ,
Ruilei Qi ,
Qingqing Dou  and
Mi Yan
Tianyu Ma
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Changsheng Zhang
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Ruilei Qi
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Qingqing Dou
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Mi Yan*
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
*
a)Address all correspondence to this author. e-mail: mse_yanmi@zju.edu.cn
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Abstract

A 〈110〉 oriented Tb0.3Dy0.7Fe1.95 alloy rod was annealed at 500 °C under a magnetic field of 0.3 T, which was applied 35° away from the rod axis. X-ray diffraction characterization and optical microscopy observation showed that both the crystal orientation and morphologies were retained after magnetic annealing. Magnetic force microscopy images exhibited obvious change of the magnetic domain configurations. The magnetostrictive performance was changed drastically. Saturation axial magnetostriction λ‖s increased from 1023 to 1650 ppm by the ratio of 61.3%, but saturation perpendicular magnetostriction λ⊥s decreased from −802 to −624 ppm. Maximum magnetostrictive strain coefficients d33 and d31 were found to be enhanced by 29.3% and 32.6%, respectively. In addition, the fields for obtaining both optimum d33 and d31 decreased, which indicates that better magnetostrictive performance can be achieved at lower external fields after magnetic annealing.

Keywords

Magnetic PropertiesScanning Probe Microscopy (SPM)Annealing
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 1 , 14 January 2011 , pp. 31 - 35
Copyright
Copyright © Materials Research Society 2011

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References

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