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Journal Articles

Effects of layer thickness and annealing process on low-frequency noise and detectivity in tunnel magnetoresistive sensors with CoFeSiB soft magnetic layers

Murali Krishnan Manikketh, Prabhanjan D. Kulkarni, Tomoya Nakatani, Hirofumi Suto, Yuya Sakuraba
Journal: Journal of Applied Physics
J. Appl. Phys. 136, 203901 (2024)
https://doi.org/10.1063/5.0231800
Published: November 2024
View article titled, Effects of layer thickness and annealing process on low-frequency noise and detectivity in tunnel magnetoresistive sensors with CoFeSiB soft magnetic layers
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Journal Articles

Large magnetoresistance and high spin-transfer torque efficiency of Co2MnxFe1−xGe (0 ≤ x ≤ 1) Heusler alloy thin films obtained by high-throughput compositional optimization using combinatorially sputtered composition-gradient film

Vineet Barwal, Hirofumi Suto, Ryo Toyama, Kodchakorn Simalaotao, Taisuke Sasaki, Yoshio Miura, Yuya Sakuraba
Journal: APL Materials
APL Mater. 12, 111114 (2024)
https://doi.org/10.1063/5.0226638
Published: November 2024
View article titled, Large magnetoresistance and high spin-transfer torque efficiency of Co<sub>2</sub>Mn<sub><em>x</em></sub>Fe<sub>1−<em>x</em></sub>Ge (0 ≤ <em>x</em> ≤ 1) Heusler alloy thin films obtained by high-throughput compositional optimization using combinatorially sputtered composition-gradient film
Open the PDF for Large magnetoresistance and high spin-transfer torque efficiency of Co<sub>2</sub>Mn<sub><em>x</em></sub>Fe<sub>1−<em>x</em></sub>Ge (0 ≤ <em>x</em> ≤ 1) Heusler alloy thin films obtained by high-throughput compositional optimization using combinatorially sputtered composition-gradient film in another window
Journal Articles

Growth of [001]-oriented polycrystalline Heusler alloy thin films using [001]-textured Ag buffer layer on thermally oxidized Si substrate for spintronics applications

Dolly Taparia, Taisuke T. Sasaki, Tomoya Nakatani, Hirofumi Suto, Seiji Mitani, Yuya Sakuraba
Journal: Journal of Applied Physics
J. Appl. Phys. 136, 123906 (2024)
https://doi.org/10.1063/5.0218648
Published: September 2024
View article titled, Growth of [001]-oriented polycrystalline Heusler alloy thin films using [001]-textured Ag buffer layer on thermally oxidized Si substrate for spintronics applications
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Journal Articles

Negative spin polarization of Mn2VGa Heusler alloy thin films studied in current-perpendicular-to-plane giant magnetoresistance devices

Hirofumi Suto, Vineet Barwal, Kodchakorn Simalaotao, Zehao Li, Keisuke Masuda, Taisuke Sasaki, Yoshio Miura, Yuya Sakuraba
Journal: Journal of Applied Physics
J. Appl. Phys. 135, 203901 (2024)
https://doi.org/10.1063/5.0207980
Published: May 2024
View article titled, Negative spin polarization of Mn<sub>2</sub>VGa Heusler alloy thin films studied in current-perpendicular-to-plane giant magnetoresistance devices
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Journal Articles

Perspective on nanoscale magnetic sensors using giant anomalous Hall effect in topological magnetic materials for read head application in magnetic recording

Tomoya Nakatani, Prabhanjan D. Kulkarni, Hirofumi Suto, Keisuke Masuda, Hitoshi Iwasaki, Yuya Sakuraba
Journal: Applied Physics Letters
Appl. Phys. Lett. 124, 070501 (2024)
https://doi.org/10.1063/5.0191974
Published: February 2024
View article titled, Perspective on nanoscale magnetic sensors using giant anomalous Hall effect in topological magnetic materials for read head application in magnetic recording
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Includes: Supplementary data
Journal Articles

Improvement of magnetic field detectivity in electrical 1/f noise-dominated tunnel magnetoresistive sensors by AC magnetic field modulation technique

Tomoya Nakatani, Hirofumi Suto, Prabhanjan D. Kulkarni, Hitoshi Iwasaki, Yuya Sakuraba
Journal: Journal of Applied Physics
J. Appl. Phys. 134, 213904 (2023)
https://doi.org/10.1063/5.0180812
Published: December 2023
View article titled, Improvement of magnetic field detectivity in electrical 1/<em>f</em> noise-dominated tunnel magnetoresistive sensors by AC magnetic field modulation technique
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Journal Articles

Tunnel magnetoresistance sensors with symmetric resistance-field response and noise properties under AC magnetic field modulation

Tomoya Nakatani, Hirofumi Suto, Prabhanjan D. Kulkarni, Hitoshi Iwasaki, Yuya Sakuraba
Journal: Applied Physics Letters
Appl. Phys. Lett. 121, 192406 (2022)
https://doi.org/10.1063/5.0119677
Published: November 2022
View article titled, Tunnel magnetoresistance sensors with symmetric resistance-field response and noise properties under AC magnetic field modulation
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Includes: Supplementary data
Journal Articles

Phase stability and half-metallic character of off-stoichiometric Co2FeGa0.5Ge0.5 Heusler alloys

Zixi Chen, Yuya Sakuraba, Yoshio Miura, Zehao Li, Taisuke Sasaki, Hirofumi Suto, Varun K. Kushwaha, Tomoya Nakatani, Seiji Mitani, Kazuhiro Hono
Journal: Journal of Applied Physics
J. Appl. Phys. 132, 183902 (2022)
https://doi.org/10.1063/5.0109802
Published: November 2022
View article titled, Phase stability and half-metallic character of off-stoichiometric Co<sub>2</sub>FeGa<sub>0.5</sub>Ge<sub>0.5</sub> Heusler alloys
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Includes: Supplementary data
Journal Articles

Analysis method of a spin-torque oscillator using dc resistance change during injection locking to an external microwave magnetic field

Editor’s Pick
Nagarjuna Asam, Hirofumi Suto, Shingo Tamaru, Hossein Sepehri-Amin, Anton Bolyachkin, Tomoya Nakatani, Weinan Zhou, Hitoshi Kubota, Yuya Sakuraba
Journal: Applied Physics Letters
Appl. Phys. Lett. 119, 142405 (2021)
https://doi.org/10.1063/5.0058847
Published: October 2021
View article titled, Analysis method of a spin-torque oscillator using dc resistance change during injection locking to an external microwave magnetic field
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Journal Articles

Magnetization dynamics of a flux control device fabricated in the write gap of a hard-disk-drive write head for high-density recording

Featured
Hirofumi Suto, Masayuki Takagishi, Naoyuki Narita, Hitoshi Iwasaki, Tazumi Nagasawa, Gaku Koizumi, Akihiko Takeo, Tomoyuki Maeda
Journal: Journal of Applied Physics
J. Appl. Phys. 129, 103901 (2021)
https://doi.org/10.1063/5.0041561
Published: March 2021
View article titled, Magnetization dynamics of a flux control device fabricated in the write gap of a hard-disk-drive write head for high-density recording
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Journal Articles

Time-resolved imaging of an operating hard-disk-drive write head using nano-beam x-ray magnetic circular dichroism

Hirofumi Suto, Akira Kikitsu, Yoshinori Kotani, Tomoyuki Maeda, Kentaro Toyoki, Hitoshi Osawa, Nobuaki Kikuchi, Satoshi Okamoto, Tetsuya Nakamura
Journal: Journal of Applied Physics
J. Appl. Phys. 128, 133903 (2020)
https://doi.org/10.1063/5.0022571
Published: October 2020
View article titled, Time-resolved imaging of an operating hard-disk-drive write head using nano-beam x-ray magnetic circular dichroism
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Journal Articles

Microwave-magnetic-field-induced magnetization excitation and assisted switching of antiferromagnetically coupled magnetic bilayer with perpendicular magnetization

Featured
Hirofumi Suto, Taro Kanao, Tazumi Nagasawa, Koichi Mizushima, Rie Sato, Nobuaki Kikuchi, Satoshi Okamoto
Journal: Journal of Applied Physics
J. Appl. Phys. 125, 153901 (2019)
https://doi.org/10.1063/1.5089799
Published: April 2019
View article titled, Microwave-magnetic-field-induced magnetization excitation and assisted switching of antiferromagnetically coupled magnetic bilayer with perpendicular magnetization
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Journal Articles

Transient magnetization dynamics of spin-torque oscillator and magnetic dot coupled by magnetic dipolar interaction: Reading of magnetization direction using magnetic resonance

Taro Kanao, Hirofumi Suto, Kiwamu Kudo, Tazumi Nagasawa, Koichi Mizushima, Rie Sato
Journal: Journal of Applied Physics
J. Appl. Phys. 123, 043903 (2018)
https://doi.org/10.1063/1.5004632
Published: January 2018
View article titled, Transient magnetization dynamics of spin-torque oscillator and magnetic dot coupled by magnetic dipolar interaction: Reading of magnetization direction using magnetic resonance
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Journal Articles

Subnanosecond microwave-assisted magnetization switching in a circularly polarized microwave magnetic field

Hirofumi Suto, Taro Kanao, Tazumi Nagasawa, Kiwamu Kudo, Koichi Mizushima, Rie Sato
Journal: Applied Physics Letters
Appl. Phys. Lett. 110, 262403 (2017)
https://doi.org/10.1063/1.4986483
Published: June 2017
View article titled, Subnanosecond microwave-assisted magnetization switching in a circularly polarized microwave magnetic field
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Journal Articles

Switching field reduction of a perpendicular magnetic nanodot in a microwave magnetic field emitted from a spin-torque oscillator

Hirofumi Suto, Taro Kanao, Tazumi Nagasawa, Kiwamu Kudo, Koichi Mizushima, Rie Sato
Journal: Applied Physics Letters
Appl. Phys. Lett. 110, 132403 (2017)
https://doi.org/10.1063/1.4979032
Published: March 2017
View article titled, Switching field reduction of a perpendicular magnetic nanodot in a microwave magnetic field emitted from a spin-torque oscillator
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Journal Articles

Study of nonlinear ferromagnetic resonance in a nanoscale magnetic tunnel junction using diode effect

Hirofumi Suto, Kiwamu Kudo, Tazumi Nagasawa, Taro Kanao, Koichi Mizushima, Rie Sato
Journal: Applied Physics Letters
Appl. Phys. Lett. 109, 122407 (2016)
https://doi.org/10.1063/1.4963062
Published: September 2016
View article titled, Study of nonlinear ferromagnetic resonance in a nanoscale magnetic tunnel junction using diode effect
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Journal Articles

Large-amplitude, narrow-linewidth microwave emission in a dual free-layer MgO spin-torque oscillator

Tazumi Nagasawa, Kiwamu Kudo, Hirofumi Suto, Koichi Mizushima, Rie Sato
Journal: Applied Physics Letters
Appl. Phys. Lett. 105, 182406 (2014)
https://doi.org/10.1063/1.4901077
Published: November 2014
View article titled, Large-amplitude, narrow-linewidth microwave emission in a dual free-layer MgO spin-torque oscillator
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Journal Articles

Frequency stabilization of spin-torque-driven oscillations by coupling with a magnetic nonlinear resonator

Kiwamu Kudo, Hirofumi Suto, Tazumi Nagasawa, Koichi Mizushima, Rie Sato
Journal: Journal of Applied Physics
J. Appl. Phys. 116, 163911 (2014)
https://doi.org/10.1063/1.4900536
Published: October 2014
View article titled, Frequency stabilization of spin-torque-driven oscillations by coupling with a magnetic nonlinear resonator
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Journal Articles

Magnetization dynamics of a MgO-based spin-torque oscillator with a perpendicular polarizer layer and a planar free layer

Hirofumi Suto, Tao Yang, Tazumi Nagasawa, Kiwamu Kudo, Koichi Mizushima, Rie Sato
Journal: Journal of Applied Physics
J. Appl. Phys. 112, 083907 (2012)
https://doi.org/10.1063/1.4758308
Published: October 2012
View article titled, Magnetization dynamics of a MgO-based spin-torque oscillator with a perpendicular polarizer layer and a planar free layer
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Journal Articles

Delay detection of frequency modulation signal from a spin-torque oscillator under a nanosecond-pulsed magnetic field

Tazumi Nagasawa, Hirofumi Suto, Kiwamu Kudo, Tao Yang, Koichi Mizushima, Rie Sato
Journal: Journal of Applied Physics
Series: Magnetism and Magnetic Materials
J. Appl. Phys. 111, 07C908 (2012)
https://doi.org/10.1063/1.3673836
Published: February 2012
View article titled, Delay detection of frequency modulation signal from a spin-torque oscillator under a nanosecond-pulsed magnetic field
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