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>Temperature dependence of low frequency noise in magnetic tunneling junctions with Co40Fe40B20/Co70.5Fe4.5Si15B10 composed free layer
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Temperature dependence of low frequency noise in magnetic tunneling junctions with Co40Fe40B20/Co70.5Fe4.5Si15B10 composed free layer
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机译:低频噪声在磁隧道交叉点中的温度依赖性与CO 40 INF> FE 40 INF> B 20 INF> / CO 70.5 INF> FE < INF> 4.5 INF> SI 15 INF> B 10 INF>组成的自由层
Magnetic tunneling junctions (MTJ) have been widely used in magnetic random access memory (MRAM) and magnetic sensors for the large magnetoresistance (TMR). [1, 2] One of the major issues for high sensitivity sensors is to obtain a low switching field (H). Recently various ferromagnetic metals with low H, such as NiFe [3, 4] and amorphous CoFeSiB [5], have been selected as the sensing layer in MTJ sensors. Moreover, CoFeSiB has a lower saturation magnetization, which is also beneficial for reducing H. [6] With CoFeSiB as the sensing layer, the sensitivity up to 40%/Oe has been achieved in MTJ sensors. [5] Besides the high sensitivity, the noise level of the sensor devices in the low frequency regime is an important parameter, and nanotesla-scaled detectivity has been achieved in MTJ sensors. In this work, the low frequency noise in MTJs with CoFeB/CoFeSiB composed free layer has been studied.
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