High field-gradient dysprosium tips for magnetic resonance force microscopy

被引：45
|
作者：
Mamin, H. J. [1 ]
Rettner, C. T. [1 ]
Sherwood, M. H. [1 ]
Gao, L. [1 ]
Rugar, D. [1 ]
机构：
[1] IBM Res Div, Almaden Res Ctr, San Jose, CA 95120 USA
来源：
APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 01期
关键词：
D O I：
10.1063/1.3673910
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Magnetic resonance force microscopy (MRFM) is based on measuring the attonewton-scale force between nuclear or electronic spins and a magnetic tip. The force is directly proportional to the magnetic field gradient generated by the tip, making a high moment nanoscale magnet desirable. Dysprosium, with a bulk magnetization 70% higher than iron, is a suitable candidate for such a tip. We have performed MRFM to quantitatively characterize two Dy nanomagnets. We find that magnetic field gradients as high as 6MT/m (60G/nm) can be generated, a 40% enhancement compared to our previous FeCo tips. (C) 2012 American Institute of Physics. [doi: 10.1063/1.3673910]
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页数：4
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