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Influences of Induced Anisotropy on the Piezomagnetic Effect in TbDyFe Oriented Crystals

Author: ZuoRuiLei
Tutor: YanMi
School: Zhejiang University
Course: Materials Science and Engineering
Keywords: Tb-Dy-Fe Magnetic field heat treatment Induced anisotropy Magnetostrictive effect Piezomagnetic effect
CLC: TB34
Type: Master's thesis
Year: 2011
Downloads: 33
Quote: 0
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Abstract


Cubic the Laves phase TbDyFe alloy is a super - magnetostrictive material , mechanical energy and electromagnetic energy fast conversion with large strain , high energy density , fast response characteristics of the sensor for the actuator and actuator system has extensive application prospects as a 21st century strategic new material . Magnetic field heat treatment can regulate the initial distribution of magnetic domain state of TbDyFe material induced anisotropy , so as to improve the response of magnetostrictive and piezomagnetic . Lt ; , 110 gt ; the orientation Tb0.3Dy0.7Fe1.95 alloy rod off-axis magnetic field heat treatment , magnetic force microscopy morphology evolution of magnetic domains in magnetic field before and after heat treatment , the hard magnetic coupling device measuring the magnetostriction and piezomagnetic coefficient to explore the mechanism of action of the magnetic heat induced anisotropy of the magnetostriction and piezomagnetic coefficient . The main results are as follows : lt; 110 gt; the orientation Tb0.3Dy0.7Fe1.95 alloy rods placed into a 0.3 T external magnetic field angle of 35 ° after heat treatment , and axial preload stress saturation magnetostriction value λs from before the heat treatment of 1023 ppm to 1650 ppm ; pre - compressive stress is less than 20 MPa , the sample in the magnetic field after the heat treatment showed significant magnetostriction \2310 ppm; magnetic field heat treatment of the samples at a lower magnetic field in the lower preload stress can get maximum d33 , that is able to get a better magnetostrictive properties ; magnetic heat treatment for non- 180 ° domain switching , reducing the 180 ° domains change, this is the main reason for the increase of the magnetostrictive properties . The magnetic heat treatment enhances lt; 110 gt ; the piezomagnetic effect the orientation Tb0.3Dy0.7Fe1.95 crystal . Magnetic heat treatment , magnetic induction in the compressive stress of 40 MPa 0.354 T to 0.43 T, increased by 21.5% ; maximum piezomagnetic coefficient d33 from 18.86 × 10-3T/MPa improve to 19.92 10-3T/MPa increased 5.6% ; the piezomagnetic coefficient zero- bias magnetic field maximum d * 33 critical stress decreased . However , the maximum piezomagnetic coefficient d * 33 corresponding bias magnetic field increases slightly increased from 0.019 T to 0.046 T . In addition , with the bias magnetic field increases, the piezomagnetic coefficient d * 33 corresponding critical stress increases gradually . Based on the magnetic domain switching process , from the magnetic field and stress analysis of the mechanism of action of the induced anisotropy piezomagnetic effect .

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