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Suto H, Nagasawa T, Kudo K, et al. Nanoscale layer-selective readout of magnetization direction from a magnetic multilayer using a spin-torque oscillator. Nanotechnology. 2014;25(24):245501doi: 10.1088/0957-4484/25/24/245501.
Suto, H., Nagasawa, T., Kudo, K., Mizushima, K., & Sato, R. (2014). Nanoscale layer-selective readout of magnetization direction from a magnetic multilayer using a spin-torque oscillator. Nanotechnology, 25(24), 245501. https://doi.org/10.1088/0957-4484/25/24/245501
Suto, Hirofumi, et al. "Nanoscale layer-selective readout of magnetization direction from a magnetic multilayer using a spin-torque oscillator." Nanotechnology vol. 25,24 (2014): 245501. doi: https://doi.org/10.1088/0957-4484/25/24/245501
Suto H, Nagasawa T, Kudo K, Mizushima K, Sato R. Nanoscale layer-selective readout of magnetization direction from a magnetic multilayer using a spin-torque oscillator. Nanotechnology. 2014 Jun 20;25(24):245501. doi: 10.1088/0957-4484/25/24/245501. PMID: 24872254.
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Nanotechnology. 2014 Jun 20;25(24):245501. doi: 10.1088/0957-4484/25/24/245501.

Nanoscale layer-selective readout of magnetization direction from a magnetic multilayer using a spin-torque oscillator.

Nanotechnology

Hirofumi Suto, Tazumi Nagasawa, Kiwamu Kudo, Koichi Mizushima, Rie Sato

PMID: 24872254 DOI: 10.1088/0957-4484/25/24/245501

Abstract

Technology for detecting the magnetization direction of nanoscale magnetic material is crucial for realizing high-density magnetic recording devices. Conventionally, a magnetoresistive device is used that changes its resistivity in accordance with the direction of the stray field from an objective magnet. However, when several magnets are near such a device, the superposition of stray fields from all the magnets acts on the sensor, preventing selective recognition of their individual magnetization directions. Here we introduce a novel readout method for detecting the magnetization direction of a nanoscale magnet by use of a spin-torque oscillator (STO). The principles behind this method are dynamic dipolar coupling between an STO and a nanoscale magnet, and detection of ferromagnetic resonance (FMR) of this coupled system from the STO signal. Because the STO couples with a specific magnet by tuning the STO oscillation frequency to match its FMR frequency, this readout method can selectively determine the magnetization direction of the magnet.

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