Novel torque magnetometry for uniaxial anisotropy constants of thin films and its application to FePt granular thin films

Takuya Ono; Nobuaki Kikuchi; Satoshi Okamoto; Osamu Kitakami; Takehito Shimatsu

doi:10.7567/APEX.11.033002

Novel torque magnetometry for uniaxial anisotropy constants of thin films and its application to FePt granular thin films

Takuya Ono, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

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

14 Citations (Scopus)

Abstract

A technique based on torque magnetometry is proposed for precise determination of the uniaxial magnetic anisotropy constant, K_u of perpendicularly magnetized thin films, in particular for K_u larger than 10⁶ J/m³, by electrical detection of the anomalous Hall effect and exact determination of the magnetic field direction. This technique can measure the K_u value of several-nanometer-thick polycrystalline films. Further, the K_u value of FePt-C granular films, which are expected to be useful for high-density magnetic recording media, is evaluated. The intrinsic K_u value of 4-nm-thick FePt-C thin films fabricated at 450 °C is approximately 3 MJ/m³ for carbon contents up to 34 vol % C.

Original language	English
Article number	033002
Journal	Applied Physics Express
Volume	11
Issue number	3
DOIs	https://doi.org/10.7567/APEX.11.033002
Publication status	Published - 2018 Mar

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title = "Novel torque magnetometry for uniaxial anisotropy constants of thin films and its application to FePt granular thin films",

abstract = "A technique based on torque magnetometry is proposed for precise determination of the uniaxial magnetic anisotropy constant, Ku of perpendicularly magnetized thin films, in particular for Ku larger than 106 J/m3, by electrical detection of the anomalous Hall effect and exact determination of the magnetic field direction. This technique can measure the Ku value of several-nanometer-thick polycrystalline films. Further, the Ku value of FePt-C granular films, which are expected to be useful for high-density magnetic recording media, is evaluated. The intrinsic Ku value of 4-nm-thick FePt-C thin films fabricated at 450 °C is approximately 3 MJ/m3 for carbon contents up to 34 vol % C.",

author = "Takuya Ono and Nobuaki Kikuchi and Satoshi Okamoto and Osamu Kitakami and Takehito Shimatsu",

note = "Publisher Copyright: {\textcopyright} 2018 The Japan Society of Applied Physics.",

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T1 - Novel torque magnetometry for uniaxial anisotropy constants of thin films and its application to FePt granular thin films

AU - Ono, Takuya

AU - Kikuchi, Nobuaki

AU - Okamoto, Satoshi

AU - Kitakami, Osamu

AU - Shimatsu, Takehito

PY - 2018/3

Y1 - 2018/3

N2 - A technique based on torque magnetometry is proposed for precise determination of the uniaxial magnetic anisotropy constant, Ku of perpendicularly magnetized thin films, in particular for Ku larger than 106 J/m3, by electrical detection of the anomalous Hall effect and exact determination of the magnetic field direction. This technique can measure the Ku value of several-nanometer-thick polycrystalline films. Further, the Ku value of FePt-C granular films, which are expected to be useful for high-density magnetic recording media, is evaluated. The intrinsic Ku value of 4-nm-thick FePt-C thin films fabricated at 450 °C is approximately 3 MJ/m3 for carbon contents up to 34 vol % C.

AB - A technique based on torque magnetometry is proposed for precise determination of the uniaxial magnetic anisotropy constant, Ku of perpendicularly magnetized thin films, in particular for Ku larger than 106 J/m3, by electrical detection of the anomalous Hall effect and exact determination of the magnetic field direction. This technique can measure the Ku value of several-nanometer-thick polycrystalline films. Further, the Ku value of FePt-C granular films, which are expected to be useful for high-density magnetic recording media, is evaluated. The intrinsic Ku value of 4-nm-thick FePt-C thin films fabricated at 450 °C is approximately 3 MJ/m3 for carbon contents up to 34 vol % C.

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Novel torque magnetometry for uniaxial anisotropy constants of thin films and its application to FePt granular thin films

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