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structure with R3c space group. Magnetic study has revealed that Pr2FeCrO6 exhibits room-temperature ferromagnetism with a Curie temperature of about 562 K. Pr2FeCrO6 also exhibits weak ferroelectricity. Thus, given its ferroelectric and ferromagnetic nature, the Pr2FeCrO6 material can be considered as a multiferroic. In addition, due to its high Curie temperature and multiferroicity, it could......
structure with R3c space group. Magnetic study has revealed that Pr2FeCrO6 exhibits room-temperature ferromagnetism with a Curie temperature of about 562 K. Pr2FeCrO6 also exhibits weak ferroelectricity. Thus, given its ferroelectric and ferromagnetic nature, the Pr2FeCrO6 material can be considered as a multiferroic. In addition, due to its high Curie temperature and multiferroicity, it could......
room-temperature rolling, as shown by the electron backscattered diffraction images. Tensile tests showed significantly improved mechanical properties after cryogenic rolling as the yield strength was enhanced by 47% compared with room-temperature rolling.关键词:......
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磁电阻,磁阻;磁电阻比;CMR 吴安国1 (1.西南应用磁学研究所,绵阳,621000) 摘要: 自从1988年Baibich在由磁性和非磁性金属相间的(Fe/Cr)n多层膜中发现了巨磁(致)电阻(giant magnetoresistance,GMR)效应,开创了磁电子学的先河以来,世界各国竞相研究,形成了一股GMR热.而且,这股热热在GMR的理论机制,产品研制和应用研究三方面几乎同步进行,在世界科技发展史上很少有这样的先例.我国有很多大学和科研机构也纷纷加入到这个行列中来.1997年的第7~11期刊登有关于GMR的磁电子学讲座,全面介绍了各种GMR的机制及发展概况. [全文内容正在添加中] ......
alloys with a two-phase NbSS/ intermetallic Nb5Si3 structure, the Nb5Si3 provides high-temperature strength, while the Nb solid-solution phase, NbSS, contributes to room-temperature ductility and toughness... sample. With increasing Si content, i.e., the Nb5Si3 fraction, the high-temperature strength is improved considerably, but room-temperature ductility and toughness are degraded. For the sample......
room-temperature ductility. After carbonized, the Mo-CeO2 cathode material has a higher zero field emission current density and a lower work function compared with the W-ThO2 cathode material.关键词:......
Fe为过渡层的Co/Cu/Co三明治巨磁电阻效应的研究 邹世昌1,祝向荣1,潘强1,李铁1,沈勤我1,沈鸿烈1 (1.中国科学院上海冶金研究所) 摘要:用超高真空电子束蒸发方法成功制备了以不同厚度Fe为过渡层的Co/Cu/Co三明治巨磁电阻样品,与以Cr为过渡层的Co/Cu/Co三明治巨磁电阻样品比较,样品的矫顽力大大减小,因而样品的磁灵敏度有了较大地提高.当Fe过渡层的厚度为7nm时样品的磁电阻值最大.另外,温度更强烈地影响以Fe为过渡层样品的磁电阻值,在77K下样品的磁电阻曲线表现出明显的不对称性,它来源于低温下fcc Fe过渡层的反铁磁性转变. 关键词:巨磁电阻效应; Co/Cu......
离子束混合过程中Au/Fe磁性膜的巨磁电阻效应在线研究 李正孝1,李波1 (1.北京大学物理学院技术物理系,北京,100871) 摘要:在离子束混合和强磁场条件下, 在线研究了Au/Fe磁性膜的巨磁电阻效应, 发现了不同磁场强度下的离子束混合对巨磁电阻效应影响的规律, 以及不同注入条件对样品饱和磁场的影响.讨论了样品由磁性多层膜逐渐向磁性纳米颗粒膜的转变, 以及与此相关的纳米磁性颗粒在磁场作用下的非各向同性生长, 并通过高分辨透射电镜(TEM)观察证实了磁性膜样品中磁性纳米Fe颗粒存在各向异性生长现象.通过对室温放置了一年以上的磁性纳米颗粒膜样品的电磁物性测量, 证明利用离子束混合技术制......
磁电阻(MR)和巨磁电阻(GMR)测试系统 钟智勇1,陈国贞1,薛刚1 (1.电子科技大学,微电子与固体电子学院,四川成都,610054) 摘要:介绍了一种自动测试一般磁电阻和巨磁电阻材料MR比,GMR比的方法.用直列式四探针加载恒流和读出电压信号,由电磁铁提供外加磁场,在新的测试理论模型基础上通过并行8255A接口,控制多路开关选择,将模拟信号经过A/D数模变换后,再经精密放大器放大,最后采用计算机处理输出测试曲线.该系统在外磁场(μ0H)0~30mT 范围,GMR比测试精度为±0.1%. 关键词:巨磁电阻; 四探针法; 测试; [全文内容正在添加中] ......