Giant magnetoresistance in melt spun Cu‐Co alloys
Giant magnetoresistance in melt spun Cu‐Co alloys
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DOI：
10.1063/1.109511
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发表时间：
1993-04
影响因子：
4
通讯作者：
J. Wecker;R. Helmolt;L. Schultz;K. Samwer
中科院分区：
文献类型：
--
作者：
J. Wecker;R. Helmolt;L. Schultz;K. Samwer
采用熔体纺丝法制备了x=0.1和x=0.2的Cu1−xCox合金。快速凝固过程导致Co在Cu中的溶解度扩大，尽管在淬火过程中已经有一些Co析出。在as -淬火带中，磁电阻（MR）仅为1.5%左右。随着过饱和Cu基体中Co析出相的形核和生长受到控制，其强度急剧增加。当Co团簇呈超顺磁性时，440℃时效后的Cu90Co10在300 K时的MR最高，为11%。只有在较高的退火温度或较低的测量温度下才能达到饱和。对于最佳退火样品，在30k时MR增加到36%。
Cu1−xCox alloys with x=0.1 and x=0.2 have been prepared by conventional melt spinning. The rapid solidification process results in an extended solubility of Co in Cu although some Co precipitates already during quenching. In the as‐quenched ribbons, the magnetoresistance (MR) is only of the order of 1.5%. It increases dramatically with the controlled nucleation and growth of Co precipitates from the supersaturated Cu matrix. The highest MR of 11% at 300 K occurs for Cu90Co10 after an aging at about 440 °C when the Co clusters are superparamagnetic. Saturation is possible only after a higher annealing or at lower measuring temperatures. For the optimally annealed samples the MR increases to 36% at 30 K.