Magnetic dissipation and fluctuations in individual nanomagnets measured by ultrasensitive cantilever magnetometry

被引：132
作者：
Stipe, BC
Mamin, HJ
Stowe, TD
Kenny, TW
Rugar, D
机构：
[1] IBM Res Div, Almaden Res Ctr, San Jose, CA 95120 USA
[2] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA
[3] Stanford Univ, Dept Mech Engn, Stanford, CA 94305 USA
来源：
PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 13期
关键词：
D O I：
10.1103/PhysRevLett.86.2874
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Cantilever magnetometry with moment resolution better than 10(4) mu (B) was used to study individual nanomagnets. By using the fluctuation-dissipation theorem to interpret measurements of field-induced cantilever damping, the low frequency spectral density of magnetic fluctuations could be determined with resolution better than 1 mu (B) Hz(-1/2). Cobalt nanowires exhibited significant magnetic dissipation and the associated magnetic fluctuations were found to have 1/f frequency dependence. In individual submicron rare-earth alloy magnets, the dissipation/fluctuation was very small and not distinguishable from that of a bare silicon cantilever.
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页码：2874 / 2877
页数：4
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