High field-gradient dysprosium tips for magnetic resonance force microscopy

被引：47

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：

Magnetic resonance - Iron alloys - Magnetic fields - Nanomagnetics - Cobalt alloys;

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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