Abstract Properties of noise in operation bandwidth of magnetoresistive readers arising from asymmetric oscillations of magnetization have been studied experimentally using high bandwidth time domain measurements. Different reader geometries, temperatures and external fields were used to identify the main factors leading to noise of this type. We investigate correlation between noise in device operation bandwidth and instantaneous amplitude of thermally excited magnetic resonance, which has been previously shown to correspond to asymmetric oscillations of the free layer. It is also found that waveform skewness may be used as a proxy for this correlation. We propose a routine for identification and clear differentiation of noise due to asymmetric oscillations and random telegraph noise in our experimental samples. We also introduce a method to mitigate the effect and improve the signal to noise ratio.

中文翻译：

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非对称振荡噪声的磁性阅读器测试

摘要 已经使用高带宽时域测量实验研究了由磁化的不对称振荡引起的磁阻读取器操作带宽中的噪声特性。使用不同的读取器几何形状、温度和外部场来确定导致此类噪声的主要因素。我们研究了设备操作带宽中的噪声与热激发磁共振的瞬时振幅之间的相关性，这在之前已被证明与自由层的不对称振荡相对应。还发现波形偏斜可以用作这种相关性的代理。我们提出了一个例程，用于识别和清楚区分由于我们的实验样本中的不对称振荡和随机电报噪声引起的噪声。