Observation of microwave-assisted magnetization reversal in perpendicular recording media

Lei Lu; Mingzhong Wu; Michael Mallary; Gerardo Bertero; Kumar Srinivasan; Ramamurthy Acharya; Helmut Schultheiß; Axel Hoffmann

doi:10.1063/1.4816798

Observation of microwave-assisted magnetization reversal in perpendicular recording media

Lei Lu, Mingzhong Wu, Michael Mallary, Gerardo Bertero, Kumar Srinivasan, Ramamurthy Acharya, Helmut Schultheiß, Axel Hoffmann

Research output: Contribution to journal › Article › peer-review

Abstract

This letter reports microwave-assisted magnetization reversal (MAMR) in a 700-Gbit/in² perpendicular media sample. The microwave fields were applied by placing a coplanar waveguide on the media sample and feeding it with narrow microwave pulses. The switching states of the media grains were measured by magnetic force microscopy. For microwaves with a frequency close to the ferromagnetic resonance (FMR) frequency of the media, MAMR was observed for microwave power higher than a certain threshold. For microwaves with certain high power, MAMR was observed for a broad microwave frequency range which covers the FMR frequency and is centered below the FMR frequency.

Original language	English (US)
Article number	042413
Journal	Applied Physics Letters
Volume	103
Issue number	4
DOIs	https://doi.org/10.1063/1.4816798
State	Published - Jul 22 2013
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4816798

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abstract = "This letter reports microwave-assisted magnetization reversal (MAMR) in a 700-Gbit/in2 perpendicular media sample. The microwave fields were applied by placing a coplanar waveguide on the media sample and feeding it with narrow microwave pulses. The switching states of the media grains were measured by magnetic force microscopy. For microwaves with a frequency close to the ferromagnetic resonance (FMR) frequency of the media, MAMR was observed for microwave power higher than a certain threshold. For microwaves with certain high power, MAMR was observed for a broad microwave frequency range which covers the FMR frequency and is centered below the FMR frequency.",

author = "Lei Lu and Mingzhong Wu and Michael Mallary and Gerardo Bertero and Kumar Srinivasan and Ramamurthy Acharya and Helmut Schulthei{\ss} and Axel Hoffmann",

note = "Funding Information: This work was supported in part by the U. S. National Institute of Standards and Technology (60NANB10D011) and Western Digital Technologies. Work at Argonne and use of the Center for Nanoscale Materials was supported by the U.S. Department of Energy, Office of Basic Energy Sciences (DE-AC02-06CH11357). ",

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AU - Lu, Lei

AU - Wu, Mingzhong

AU - Mallary, Michael

AU - Bertero, Gerardo

AU - Srinivasan, Kumar

AU - Acharya, Ramamurthy

AU - Schultheiß, Helmut

AU - Hoffmann, Axel

N1 - Funding Information: This work was supported in part by the U. S. National Institute of Standards and Technology (60NANB10D011) and Western Digital Technologies. Work at Argonne and use of the Center for Nanoscale Materials was supported by the U.S. Department of Energy, Office of Basic Energy Sciences (DE-AC02-06CH11357).

PY - 2013/7/22

Y1 - 2013/7/22

N2 - This letter reports microwave-assisted magnetization reversal (MAMR) in a 700-Gbit/in2 perpendicular media sample. The microwave fields were applied by placing a coplanar waveguide on the media sample and feeding it with narrow microwave pulses. The switching states of the media grains were measured by magnetic force microscopy. For microwaves with a frequency close to the ferromagnetic resonance (FMR) frequency of the media, MAMR was observed for microwave power higher than a certain threshold. For microwaves with certain high power, MAMR was observed for a broad microwave frequency range which covers the FMR frequency and is centered below the FMR frequency.

AB - This letter reports microwave-assisted magnetization reversal (MAMR) in a 700-Gbit/in2 perpendicular media sample. The microwave fields were applied by placing a coplanar waveguide on the media sample and feeding it with narrow microwave pulses. The switching states of the media grains were measured by magnetic force microscopy. For microwaves with a frequency close to the ferromagnetic resonance (FMR) frequency of the media, MAMR was observed for microwave power higher than a certain threshold. For microwaves with certain high power, MAMR was observed for a broad microwave frequency range which covers the FMR frequency and is centered below the FMR frequency.

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Observation of microwave-assisted magnetization reversal in perpendicular recording media

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