Anisotropy compensation and high low-field magnetostriction of epoxy/Tb1−xHox(Fe0.8Co0.2)2 composites (0.60 ≤ x ≤ 1.0) |
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| Authors: | JJ Liu HY YingXC Liu PZ Si |
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| Affiliation: | a State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of Materials Science & Chemical Engineering, Ningbo University, Ningbo 315211, China
b College of Materials Science & Engineering, China Jiliang University, Hangzhou 310018, China |
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| Abstract: | The anisotropy compensation and magnetostrictive properties of Tb1−xHox(Fe0.8Co0.2)2 (0.60 ≤ x ≤ 1.0) alloys have been investigated. The easy magnetization direction (EMD) at room temperature rotates from the 〈1 1 1〉 axis (x ≤ 0.75) to the 〈1 0 0〉 axis (x ≥ 0.90) through an intermediate state 〈1 1 0〉, subjected to the anisotropy compensation between Tb3+ and Ho3+ ions. Composition anisotropy compensation is realized near x = 0.75. The Tb0.25Ho0.75(Fe0.8Co0.2)2 alloy has a minimum anisotropy and a large spontaneous magnetostriction coefficient λ111 (≈740 ppm) at room temperature. The strong 〈1 1 1〉-oriented 1-3 epoxy-bonded composite has been fabricated by curing under a moderate magnetic field. A high low-field magnetostriction of about 400 ppm at 3 kOe is obtained for the 1-3 epoxy/Tb0.25Ho0.75(Fe0.8Co0.2)2 composite with 40-vol% alloy particles, which can be attributed to the low magnetic anisotropy, EMD lying along 〈1 1 1〉 direction, the strong 〈1 1 1〉-textured orientation and the chain structure. |
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| Keywords: | 75 80 +q 75 30 Gw 75 60 Ej |
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