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Ultrasensitive mechanical detection of magnetic moment using a commercial disk drive write head

Ultrasensitive mechanical detection of magnetic moment using a commercial disk drive write head

Datum: 29. November 2016 13:00

Ort: NWZII, 6.331

Nanoscale control over magnetic fields is an essential capability in many areas of science and technology, including magnetic data storage, spintronics, quantum control of spins, and nanoscale magnetic resonance imaging. The attainable magnetic field strength and switching speed impose severe restrictions on applications and limit the range of feasible experiments. In our work, we demonstrate that the write pole of a commercial hard drive is ideally suited to overcome these restrictions. We have developed a new variation of scanning force microscopy that allows us to characterize the magnetic field generated by a write head with a resolution of about 10 nm. We find fields up to » 0.9 T and field gradients up to 2.8 × 107 T/m, which is roughly 5 times higher than those of the best static tips. By design, field and gradient are switchable in » 1 ns. Write heads could thus be a powerful tool for many research groups and facilitate novel experiments.

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