Thermomagnetic fluctuations and hysteresis loops of magnetic cantilevers for magnetic resonance force microscopy |
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Authors: | Tse Nga Ng Jenkins NE Marohn JA |
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Affiliation: | Dept. of Chem. & Chem. Biol., Cornell Univ., Ithaca, NY, USA; |
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Abstract: | We have used frequency-shift cantilever magnetometry to study individual nickel magnets patterned at the end of ultra-sensitive silicon cantilevers for use in magnetic resonance force microscopy (MRFM). We present a procedure for inferring a magnet's full hysteresis curve from the response of cantilever resonance frequency versus magnetic field. Hysteresis loops and small-angle fluctuations were determined at 4.2 K with an applied magnetic field up to 6 T for magnets covering a range of dimensions and aspect ratios. Compared to magnetic materials with higher anisotropy, we find that nickel is preferable for MRFM experiments on nuclear spins at high magnetic fields. |
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