Microwires coated by glass: A new family of soft and hard magnetic materials
Microwires coated by glass: A new family of soft and hard magnetic materials
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玻璃涂层微丝：软磁和硬磁材料的新系列
DOI：
10.1557/jmr.2000.0303
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发表时间：
2000
影响因子：
2.7
通讯作者：
V. Larin
中科院分区：
文献类型：
--
作者：
A. Zhukov;J. González;J. Blanco;M. Vázquez;V. Larin
泰勒-乌利托夫斯基技术用于制造微小的铁磁非晶态和纳米晶金属线，该金属线覆盖有绝缘玻璃涂层，具有具有巨大技术意义的磁性。对于具有正磁致伸缩的微线，观察到单个且大的巴克豪森跳跃。负磁致伸缩微线表现出几乎无磁滞的行为，易轴横向于线轴。在充分热处理后，在磁致伸缩几乎为零的非晶 CoMnSiB 微丝中观察到增强的磁软度（初始磁导率，μm，高达 14000）和巨磁阻抗（GMI）效应（在 10 MHz 时高达 140%）。观察到 GMI 和磁特性对外部拉应力的高敏感性。经过热处理，FeSiBCuNb 非晶微丝失透成纳米晶体结构，磁软度增强。即使在第二次结晶过程之后也观察到磁双稳定性（切换磁场增加超过 2 个数量级，高达 5.5 kA/m）。当矫顽力增加到 60 kA/m 时，通过 Taylor-Ulitovski 技术制造的 Co-Ni-Cu 和 Fe-Ni-Cu 微丝中的亚稳态相分解，获得了硬磁材料。设计了一种基于磁双稳态的磁传感器。
The Taylor–Ulitovski technique was employed for fabrication of tiny ferromagnetic amorphous and nanocrystalline metallic wires covered by an insulating glass coating with magnetic properties of great technological interest. A single and large Barkhausen jump was observed for microwires with positive magnetostriction. Negative magnetostriction microwires exhibited almost unhysteretic behavior with an easy axis transverse to the wire axis. Enhanced magnetic softness (initial permeability, μ_ι, up to 14000) and giant magneto impedance (GMI) effect (up to 140% at 10 MHz) was observed in amorphous CoMnSiB microwires with nearly zero magnetostriction after adequate heat treatment. Large sensitivity of GMI and magnetic characteristics on external tensile stresses was observed. Upon heat treatment, FeSiBCuNb amorphous microwires devitrificated into a nanocrystalline structure with enhanced magnetic softness. The magnetic bistability was observed even after the second crystallization process (increase of switching field by more than 2 orders of magnitude up to 5.5 kA/m). Hard magnetic materials were obtained as a result of decomposition of metastable phases in Co–Ni–Cu and Fe–Ni–Cu microwires fabricated by Taylor–Ulitovski technique when the coercivity increased up to 60 kA/m. A magnetic sensor based on the magnetic bistability was designed.