Secondary resonance magnetic force microscopy

Tanaka, Shunya; Yasuo, Azuma; Majima, Yutaka

doi:10.1063/1.4705400

Cited by 8 publications

(1 citation statement)

References 13 publications

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“…Moreover, because of the diamond tip's well-defined material composition and extremely sharp end radius (<10 nm), quantitative and high-resolution field maps of the pole can be reconstructed. Our method thus provides advantages over magnetic force microscopy (MFM) 13 14 15 16 17 and electron holography 18 , which are difficult to quantify, barely reach sufficient resolution, or provide two-dimensional projections.…”

mentioning

confidence: 99%

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

Tao¹,

Eichler²,

Holzherr³

et al. 2016

Nat Commun

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Sensitive detection of weak magnetic moments is an essential capability in many areas of nanoscale science and technology, including nanomagnetism, quantum readout of spins and nanoscale magnetic resonance imaging. Here we show that the write head of a commercial hard drive may enable significant advances in nanoscale spin detection. By approaching a sharp diamond tip to within 5 nm from a write pole and measuring the induced diamagnetic moment with a nanomechanical force transducer, we demonstrate a spin sensitivity of 0.032 μB Hz−1/2, equivalent to 21 proton magnetic moments. The high sensitivity is enabled in part by the pole's strong magnetic gradient of up to 28 × 106 T m−1 and in part by the absence of non-contact friction due to the extremely flat writer surface. In addition, we demonstrate quantitative imaging of the pole field with ∼10 nm spatial resolution. We foresee diverse applications for write heads in experimental condensed matter physics, especially in spintronics, ultrafast spin manipulation and mesoscopic physics.

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