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26 April 2024

» arxiv » 1504.7104

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Probing the magnetic moment of FePt micromagnets prepared by Focused Ion Beam milling
H.C. Overweg ; A.M.J. den Haan ; H.J.Eerkens ; P.F.A. Alkemade ; A.L. La Rooij ; R.J.C. Spreeuw ; L. Bossoni ; T.H. Oosterkamp ;
Date:	27 Apr 2015
Abstract:	We investigate the degradation of the magnetic moment of a 300 nm thick FePt film induced by Focused Ion Beam (FIB) milling. A $1~mu mathrm{m} imes 8~mu mathrm{m}$ rod is milled out of a film by a FIB process and is attached to a cantilever by electron beam induced deposition. Its magnetic moment is determined by frequency-shift cantilever magnetometry. We find that the magnetic moment of the rod is $mu = 1.1 pm 0.1 imes 10 ^{-12} mathrm{Am}^2$, which implies that 70% of the volume of the magnetic layer is undamaged by the FIB milling process. This result leads to important implications for atom trapping and magnetic resonance force microscopy (MRFM), that are addressed in this paper.
Source:	arXiv, 1504.7104
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