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Write head imaging paper appeared in Nature Communications

Ye, Alex and Tim's paper on the imaging of the write pole magnetic field of a commercial disk drive is published in Nature Communications.

by Christian Degen
Write head schematic
A sharp diamond needle (green) attached to an ultrasensitive cantilever (light grey) is scanned over the ~60nm x 90nm magnetic pole (red-grey) of a disk drive write head. By measuring the induced diamagnetic force as a function of position, the pole magnetic filed (blue) can be quantitatively reconstructed with 10 nm resolution.

Ye, Alex and Tim's paper on the imaging of the write pole magnetic field of a commercial disk drive is published in Nature Communications. The measurements were enabled by scanning an extremely sharp diamond tip over the disk drive pole, and measuring the induced minute diamagnetic force by a nanomechanical force sensor. Gradients up to 28 MT/m and magnetic moments down to 0.03 Bohr magnetons could be detected.

Y. Tao, A. Eichler, T. Holzherr, and C. L. Degen, Ultrasensitive mechanical detection of magnetic moment using a commercial disk drive write head. external page Nature Communications 7, 12714 (2016). Download PDF (PDF, 1.5 MB) Download suppl (PDF, 5.2 MB)

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