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1. 发明授权

US06632517B1 Low field magnetoresistance of intergranular tunneling in field-aligned chromium dioxide powders 失效
标题翻译：场对齐二氧化铬粉末晶间隧道的低场磁阻
公开(公告)号：US06632517B1
公开(公告)日：2003-10-14
申请号：US09934458
申请日：2001-08-21
申请人： Jinke Tang , Jianbiao Dai
发明人： Jinke Tang , Jianbiao Dai
IPC分类号： G11B539
CPC分类号： G01R33/09 , H01F1/408 , H01F10/1936 , H01F41/14 , Y10T428/1121 , Y10T428/1136 , Y10T428/256 , Y10T428/265
摘要： The magnetic and magnetotransport properties of field-aligned single domain half-metallic CrO2 powders have been studied. Needle-shaped nanoparticles of CrO2 have been aligned in a strong magnetic field. The aligned powder sample shows a strong anisotropy along the alignment direction. The conduction mechanism of the aligned CrO2 powder sample has been examined and is consistent with the intergranular spin dependent tunneling. Negative tunneling magnetoresistance (TMR) of about 41% is achieved in a small field in the vicinity of the coercive field at 5 K. The magnetoresistance (MR) versus field curve shows two well-separated narrow peaks at the coercive fields and resembles that of a magnetic tunnel junction. This junction-like MR results from the narrow switching field distribution of the aligned powders. The results suggest that the aligned magnetic CrO2 particles may find novel applications in spin transport structures and devices.
摘要翻译：已经研究了场对齐单畴半金属CrO 2 粉末的磁性和磁性传输特性。已经在强磁场中对准了CrO 2 的针状纳米颗粒。对准的粉末样品沿着取向方向显示出强烈的各向异性。已经检查了对准的CrO 2 粉末样品的传导机理，并且与晶间自旋相关隧道一致。在5K的矫顽磁场附近的小场中实现了大约41％的负隧穿磁阻（TMR）。磁阻（MR）对场曲线显示出在矫顽场上两个分离得很好的窄峰，类似于磁隧道结。这种结状MR由对准的粉末的窄的开关场分布产生。结果表明，对准磁性CrO 2 颗粒可能会在自旋传输结构和器件中发现新的应用。

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