Superparamagnetic Behavior of Pt/CoFe/Pt Nanowires With Decreasing Wire Width
- Superparamagnetic Behavior of Pt/CoFe/Pt Nanowires With Decreasing Wire Width
- 이재철; 김갑진; 이창원; 조영진; 서순애; 유천열; 신경호; 최석봉
- Nanowire; superparamagnetism; thermal activation
- Issue Date
- IEEE transactions on magnetics
- VOL 45, NO 10, 3543-3545
- We present experimental demonstration that the thermal unstability grows with reducing the width of Pt/CoFe/Pt nanowires on the
way to the superparamagnetic transition. The magnetic hysteresis loops measured at room temperature using a magneto-optical Kerr
effect system reveal that the coercive field decreases drastically when the nanowire width is reduced smaller than 160 nm. To understand
the origin of the coercive field reduction, the coercive field is measured with varying the sweep rate of the external magnetic field and
then, analyzed with a thermally-activated magnetization reversal model. It is revealed that the reduction of the coercive field is mainly
ascribed to the decrement of the thermal stability parameter, which in turn induces the abrupt reduction of the retention time down to
a few seconds.
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