We measure the dynamic resistance of a Co/Cu/Co trilayer nanopillar at variedmagnetic field $H$ and current $I$. The resistance displays the usual behavior,almost symmetric in $H$, both when magnetization switching is hysteretic atsmall $I,H$, and reversible at larger $I,H$. We show differences in the $I,H$magnetization stability diagram measured by holding $I$ fixed and varying $H$and vice versa. We also show how the peak in $dV/dI$ associated with telegraphnoise in the reversible switching regime, is calculated from the telegraphnoise variations with $I$. Lastly, we show data for a similar sample thatdisplays behavior asymmetric in $H$, and a negative reversible switching peakinstead of a usual positive one.
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机译：我们在变化的磁场$ H $和电流$ I $下测量了Co / Cu / Co三层纳米柱的动态电阻。当磁化切换在较小的$ I，H $时是磁滞的，而在较大的$ I，H $时是可逆的时，电阻表现出通常的行为，即在$ H $中几乎是对称的。我们在$ I，H $磁化稳定性图中显示了差异，方法是将$ I $固定并改变$ H $，反之亦然。我们还展示了如何根据可逆切换方式中与电报噪声相关的$ dV / dI $的峰值，是根据具有$ I $的电报噪声变化来计算的。最后，我们显示了一个类似样本的数据，该样本显示了$ H $中的行为不对称，并且显示了一个可逆的负开关峰值，而不是通常的正峰值。
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