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magnetostriction and spin reorientation in ferromagnetic Laves phase Pr(Ga_(x)Fe_(1-x))_(1.9) compounds

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Chinese Physics B 2021年第6期30卷 564-569页

作者： Min-Yu Zeng Qing Tang Zhi-Wei Mei Cai-Yan Lu Yan-Mei Tang Xiang Li Yun He Ze-Ping Guo Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology Guangxi Normal UniversityGuilin 541004China School of Electronic Engineering and Automation Guilin University of Electronic TechnologyGuilin 541004China

The magnetostriction, magnetization, and spin reorientation properties in Pr(Ga_(x)Fe_(1-x))_(1.9) alloys have been investigated by high-precision x-ray diffraction(XRD) step scanning, magnetization, and Mossbauer spectra measurements. Ga substitution reduces the magnetostriction(λ_(||)) with magnetic field H ≥ 8 kOe(1 Oe = 1.33322×10^(2) Pa), but it also increases the λ|| value when H ≤ 8 kOe at 5 K. Spin-reorientations(SR) are observed in all the alloys investigated, as determined by the step scanned XRD, Mossbauer spectra, and the abnormal temperature dependence of magnetization. An increase of the spin reorientation temperature(T_(SR)) due to Ga substitution is found in the phase diagram, which is different from the decrease one in many R(T_(x) Fe_(1-x))_(1.9)(T = Co, Al, Mn) alloys. The present work provides a method to control the easy magnetization direction(EMD) or T_(SR) for developing an anisotropic compensation system.

关键词： easy magnetization direction(EMD) magnetostriction spin-reorientation

magnetostriction and magnetization of <110> oriented Tb0.27Dy0.73Fe1.95 alloys with different compressive prestresses

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Rare Metals 2020年第2期39卷 176-180页

作者： Xing Mu Hai-Jun Tang Xue-Xu Gao Xiao-Qian Bao Ji-Heng Li State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China China Academy of Civil Aviation Science and Technology Beijing100028China

oriented Tb0.27Dy0.73Fe1.95 alloys were studied under different applied compressive *** saturation magnetostriction by 500×10-6 is obtained for the sample under 5 MPa than that under no applied *** understand the effect of prestress on the magnetostrictive coefficient,differential magnetostrictive coefficient,relative permeability and coercive force were studied in *** results show that the maximum differential magnetostrictive coefficient is about 37 x 10-9 m·A-1,about two times that without *** addition,the saturation magnetostriction coefficient increases gradually with the stress increasing,while the maximum differential magnetostrictive coefficient *** saturation inductions under different stresses are similar to a value of about 1.1 *** relative permeability decreases with stress increasing.

关键词： Tb-Dy-Fe Compressive prestress magnetostriction

magnetostriction,composition and microstructure of Tb_(0.29)(Dy(1-x)Pr_x)_(0.71)Fe_(1.97) alloys with heat treatment

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Journal of Rare Earths 2013年第6期31卷 577-581页

作者：张绍强张茂才乔祎刘敏霞王红成徐永钊 College of Materials Science and Engineering South China University of Technology Department of Electronic Engineering Dongguan University of Technology State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

Tb0.29（Dy1–xPrx）0.71Fe1.97 （x=0, 0.1, 0.2 and 0.3） alloys prepared by the directional solidification method were treated at 1073, 1123, 1173, 1223 and 1273 K for 4 h for homogenization, respectively. The magnetostriction, micro-morphology and composition distribution were studied by the standard resistance strain gauge technique, optical microscopy and scanning electron microscopy-energy dispersive X-ray spectroscopy （SEM-EDS）. The results indicated that heat treatment could make the microstructure of alloys homogeneous effectively and improve the magnetostriction significantly. The optimum temperature was 1223 K. Compared to the as-cast ones, the increase amplitudes of magnetostriction of the corresponding samples were 39.5%, 64.9%, 95.3% and 50.8% when x=0, 0.1, 0.2 and 0.3, respectively at the compressive stress of 2 MPa and a magnetic field of 80 kA/m. The compressive stress could also improve the magnetostriction. However, further Pr element addition and over high heat treatment temperature would lead to the excessive decomposition of PrFe2 and destroy the homogeneity, resulting in the decline of magnetostriction of alloys.

关键词： TbDyPrFe alloys heat treatment magnetostriction microstructure rare earths

magnetostriction and hysteresis of <110> oriented TbDyHoFe_(1.95) alloy

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Journal of Rare Earths 2010年第S1期28卷 403-405页

作者：张洪波庞艳荣温丽娟蒋成保 School of Quality and Technical Supervision Hebei University School of Materials Science and Engineering Beihang University

(Tb0.36Dy0.64)1-xHoxFe1.95 magnetostrictive alloys with orientation were prepared by zone melting directionally solidified *** magnetostrictive performance and hysteresis of aligned polycrystalline(Tb0.36Dy0 64)1-xHoxFe1.95 were investigated under applied magnetic field H(0magnetostriction from-60 to 80 *** obvious magnetostrictive "jump" effect was observed in these samples from-60 to 80 *** pre-stress and temperature dependence of the Wh was also *** the temperature range from-60 to 80 oC,the magnetostriction increased with temperature decreased,while the magnetostriction hysteresis decreased,with the pre-stress increased,but the magnetostriction and the magnetostrictive hysteresis increased.

关键词： magnetostriction magnetostrictive hysteresis TbDyHoFe alloy rare earths

magnetostriction and Acoustics Properties of Tb_(1-x)Dy_x (Fe_(1-y)Mn_y)_(1.95) Alloys and Their Application to Sonar Transducers

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Journal of Rare Earths 2000年第1期18卷 54-56页

作者：杜挺张洪平朱厚卿 Central Iron & Steel Research Institute Beijing 100081 China Institute of Acoustics Chinese Academy of Sciences Beijing 100080 China

The magnetostriction and acoustics properties of Tb1-x xDyx (Fe1-yMny) 1.95 alloys and their application to sonar transducers were studied. The following results were obtained from experiments. When the applied magnetic field intensity is ≥ 800 kA·m-1, the magnetostrictive coefficients are (1300- 1800)× 10-6. The electromechanical coupling factors are 0.84-0.93, the sound velocities 2168-2856 m·s-1 and the Young's modulus (5.06- 7.26) ×10 N·m-2. A sonar transducer made of the alloy rod, which has a total length of 300 mm and a total weight of 2 kg, is characterized by 2.4 kHz specified resonant frequency, 1 kHz frequency band, 173 kB current response and 45% electroacoustic efficiency.

关键词： rare earths Tb_(1-x)Dy_(x) (Fe_(1-y)Mn_(y))_(1.95) magnetostriction acoustics properties sonar transducer

Effect of fabrication parameters on the microstructure,in-plane anisotropy and magnetostriction of Fe-Ga thin films

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Rare Metals 2010年第6期29卷 583-588页

作者： WANG Bowen HUANG Wemnei CAO Shuying DU Yong HE Yuehui HUANG Baiyun Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Hebei University of TechnologyTianjin 300130China International Center for Materials Physics Chinese Academy of SciencesShenyang 110015China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

The microstructure,in-plane anisotropy,and magnetic properties of Fe-Ga thin films were investigated by X-ray diffraction analysis,vibrating sample magnetometer,and capacitive cantilever *** in-plane induced anisotropy is well formed by the applied magnetic field during sputtering,and the anisotropy field Hk decreases with the sputtering power *** coercivity of Fe-Ga thin films decreases with increasing power when the sputtering power is less than 60 W and increases when the power is larger than 60 *** magnetostriction of the thin films reaches 66 × 10-6 at the sputtering power of 60 *** Fe-Ga films,which exhibit good field sensitivity,low coercivity and high magnetostriction,have been fabricated at the power of 60 W,and they can be used as the materials of magnetostrictive transducers.

关键词： metallic thin films magnetostriction magnetron sputtering anisotropy

Short range order transformation and magnetostriction of Fe_(83)Ga_(17) ribbons

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Chinese Physics B 2011年第5期20卷 393-400页

作者：朱洁彭福玲方美玲李纪恒高学绪于荣海 State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing School of Materials Science and Engineering Beihang University

The relationship between magnetostriction and structure of melt-spun Fes3Ga17 ribbons are investigated by XRD and M5ssbauer spectrum technique （MS）. As the heat-treatment temperature increases from 650℃ to 800℃, the magnetostriction coefficient of Fes3Ga17 ribbon first increases and then decreases. The largest magnetostriction coeiffcient （-578.4 ppm） is achieved in those specimens quenched at 750oc. According to the XRD and MSssbauer spectrum anal- ysis, a small quantity of DO3 phase is precipitated in Fe83Ga17 ribbons when quenched from 650℃ and the DO3 phase is gradually transformed into B2-1ike phase if quenched at higher temperature. However, both DO3 and B2-1ike phases disappear when the temperature increases up to 800℃. From this point of view, B2-1ike phase might be beneficial to the enhancement of magnetostrictive properties of melt-spun ribbons.

关键词： Fe-Ga alloy magnetostriction MSssbauer spectroscopy short range order

Influence of Tb on easy magnetization direction and magnetostriction of PrFe1.9 alloy

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Chinese Physics B 2019年第11期28卷 333-338页

作者： Chang-Xuan He Yan-Mei Tang Xiang Li Yun He Cai-Yan Lu Ze-Ping Guo College of Physics and Technology Guangxi Normal UniversityGuilin 541004China School of Electronic Engineering and Automation Guilin University of Electronic TechnologyGuilin 541004China

The crystal structures, magnetization, and spontaneous magnetostriction of ferromagnetic Laves phase Pr1-xTbxFe1.9 compounds are investigated in a temperature range between 5 K and 300 K. High resolution synchrotron x-ray diffraction(XRD) analysis shows that different proportions of Tb in Pr1-xTbxFe1.9 alloys can result in different easy magnetization directions(EMD) below 70 K, i.e., [100] with x = 0.0, and [111] with x ≥ 0.1. This indicates Tb substitution can lead the EMD to change from [100] to [111] with x rising from 0.0 up to 0.1. The Tb substitution for Pr reduces the saturation magnetization Ms and the magnetostriction to their minimum value when x = 0.6, but it can increase low-field(0 ≤ H ≤9 kOe, the unit 1 Oe = 79.5775 A·m-1) magnetostriction when x = 0.8 and 1.0 at 5 K. This can be attributed to the larger magnetostriction of PrFe1.9 than that of TbFe1.9, as well as the decrease of the resulting anisotropy due to Tb substitution at low temperatures.

关键词： Tb substitution spin reorientation magnetostriction easy magnetization direction(EMD)

Enhanced magnetostriction of a Narrow Hysteresis Tb_(0.26)Dy_(0.54)Ho_(0.20)Fe_2 Alloy

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Acta Metallurgica Sinica(English Letters) 2013年第4期26卷 461-466页

作者： Xingwen PAN Changsheng ZHANG Tianyu MA Mi YAN Jing LI State Key Laboratory of Silicon Materials Department of Materials Science and EngineeringCyrus Tang Center for Sensor Materials and ApplicationsZhejiang University

In this work, a magnetic annealing method used to enhance the magnetostrictive property of a narrow hysteresis alloy ***0.20Fe2 is reported. Cylindrical-rod shaped specimen with 〈110〉 crystal orientation was fabricated using zone-melting unidirectional solidification technique, followed by annealing in a transverse magnetic field of 366 kA/m. The crystal orientation and bi-phase solidified morphology can be retained after magnetic annealing. A high magnetostriction of 1.508×10^-3 was obtained in the magnetically annealed specimen, which is 25.2% larger than the untreated one. Simultaneously, the magnetostriction hysteresis width is slightly enlarged from 4.45 to 6.36 kA/m, which is still much lower than that of the Ho-free ***2 alloy. The additional anisotropy which is induced by magnetic annealing, as reflected by the magnetic hysteresis loops, is responsible for the enhancement of magnetostrictive performance.

关键词： magnetostriction magnetostriction hysteresis Induced anisotropy