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Journal Articles

Magneto-ionic and electrostatic gating of magnetism: Phenomena and devices

L. Herrera Diez, D. Chiba, D. A. Gilbert, S. Granville, K. Leistner
Journal: Applied Physics Letters
Appl. Phys. Lett. 123, 130401 (2023)
https://doi.org/10.1063/5.0176639
Published: September 2023
View article titled, Magneto-ionic and electrostatic gating of magnetism: Phenomena and devices
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Journal Articles

Process gas dependence of spin–orbit torque in Pt/NiO/Co structures

T. Morita, T. Koyama, D. Chiba
Journal: Applied Physics Letters
Appl. Phys. Lett. 122, 262402 (2023)
https://doi.org/10.1063/5.0155112
Published: June 2023
View article titled, Process gas dependence of spin–orbit torque in Pt/NiO/Co structures
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Includes: Supplementary data
Journal Articles

Chirality-induced effective field in Pt/Co/MgO system with spatial anisotropy-modulation

T. Koyama, Y. Nakatani, D. Chiba
Journal: Applied Physics Letters
Appl. Phys. Lett. 120, 172402 (2022)
https://doi.org/10.1063/5.0089015
Published: April 2022
View article titled, Chirality-induced effective field in Pt/Co/MgO system with spatial anisotropy-modulation
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Includes: Supplementary data
Journal Articles

CoFeB/MgO-based magnetic tunnel junctions for film-type strain gauge

K. Saito, A. Imai, S. Ota, T. Koyama, A. Ando, D. Chiba
Journal: Applied Physics Letters
Appl. Phys. Lett. 120, 072407 (2022)
https://doi.org/10.1063/5.0085272
Published: February 2022
View article titled, CoFeB/MgO-based magnetic tunnel junctions for film-type strain gauge
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Journal Articles

Electric-field effect on magnetic moments in Co ultra-thin films deposited on Pt

A. Obinata, T. Koyama, F. Matsukura, K. Nakamura, D. Chiba
Journal: Applied Physics Letters
Appl. Phys. Lett. 118, 152405 (2021)
https://doi.org/10.1063/5.0049052
Published: April 2021
View article titled, Electric-field effect on magnetic moments in Co ultra-thin films deposited on Pt
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Journal Articles

Control of magnetic anisotropy in a Co thin film on a flexible substrate by applying biaxial tensile strain

H. Matsumoto, S. Ota, T. Koyama, D. Chiba
Journal: Applied Physics Letters
Appl. Phys. Lett. 118, 022406 (2021)
https://doi.org/10.1063/5.0035003
Published: January 2021
View article titled, Control of magnetic anisotropy in a Co thin film on a flexible substrate by applying biaxial tensile strain
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Journal Articles

Spin–orbit torque generated by spin–orbit precession effect in Py/Pt/Co tri-layer structure

Y. Hibino, K. Hasegawa, T. Koyama, D. Chiba
Journal: APL Materials
APL Mater. 8, 041110 (2020)
https://doi.org/10.1063/5.0002326
Published: April 2020
View article titled, Spin–orbit torque generated by spin–orbit precession effect in Py/Pt/Co tri-layer structure
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Includes: Supplementary data
Journal Articles

Electric field effect on the magnetic domain wall creep velocity in Pt/Co/Pd structures with different Co thicknesses

T. Koyama, J. Ieda, D. Chiba
Journal: Applied Physics Letters
Appl. Phys. Lett. 116, 092405 (2020)
https://doi.org/10.1063/1.5143970
Published: March 2020
View article titled, Electric field effect on the magnetic domain wall creep velocity in Pt/Co/Pd structures with different Co thicknesses
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Journal Articles

Flexible CoFeB/MgO-based magnetic tunnel junctions annealed at high temperature (≥350 °C)

Editor’s Pick
S. Ota, A. Ando, T. Sekitani, T. Koyama, D. Chiba
Journal: Applied Physics Letters
Appl. Phys. Lett. 115, 202401 (2019)
https://doi.org/10.1063/1.5128952
Published: November 2019
View article titled, Flexible CoFeB/MgO-based magnetic tunnel junctions annealed at high temperature (≥350 °C)
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Journal Articles

A flexible exchange-biased spin valve for sensing strain direction

H. Matsumoto, S. Ota, A. Ando, D. Chiba
Journal: Applied Physics Letters
Appl. Phys. Lett. 114, 132401 (2019)
https://doi.org/10.1063/1.5091033
Published: April 2019
View article titled, A flexible exchange-biased spin valve for sensing strain direction
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Includes: Supplementary data
Journal Articles

Control of magnetism by electrical charge doping or redox reactions in a surface-oxidized Co thin film with a solid-state capacitor structure

T. Hirai, T. Koyama, D. Chiba
Journal: Applied Physics Letters
Appl. Phys. Lett. 112, 122408 (2018)
https://doi.org/10.1063/1.5020932
Published: March 2018
View article titled, Control of magnetism by electrical charge doping or redox reactions in a surface-oxidized Co thin film with a solid-state capacitor structure
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Journal Articles

Enhancement of the spin-orbit torque in a Pt/Co system with a naturally oxidized Co layer

Y. Hibino, T. Hirai, K. Hasegawa, T. Koyama, D. Chiba
Journal: Applied Physics Letters
Appl. Phys. Lett. 111, 132404 (2017)
https://doi.org/10.1063/1.4995292
Published: September 2017
View article titled, Enhancement of the spin-orbit torque in a Pt/Co system with a naturally oxidized Co layer
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Journal Articles

Magnetization switching by spin-orbit torque in Pt with proximity-induced magnetic moment

T. Koyama, Y. Guan, Y. Hibino, M. Suzuki, D. Chiba
Journal: Journal of Applied Physics
J. Appl. Phys. 121, 123903 (2017)
https://doi.org/10.1063/1.4978965
Published: March 2017
View article titled, Magnetization switching by spin-orbit torque in Pt with proximity-induced magnetic moment
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Journal Articles

Electric field control of magnetic anisotropy in a Co/Pt bilayer deposited on a high-κ SrTiO3

S. Nakazawa, A. Obinata, D. Chiba, K. Ueno
Journal: Applied Physics Letters
Appl. Phys. Lett. 110, 062406 (2017)
https://doi.org/10.1063/1.4976028
Published: February 2017
View article titled, Electric field control of magnetic anisotropy in a Co/Pt bilayer deposited on a high-κ SrTiO<sub>3</sub>
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Includes: Supplementary data
Journal Articles

Dielectric and magnetic characterizations of capacitor structures with an ionic liquid/MgO barrier and a ferromagnetic Pt electrode

D. Hayakawa, A. Obinata, K. Miwa, S. Ono, T. Hirai, T. Koyama, D. Chiba
Journal: AIP Advances
AIP Advances 6, 115305 (2016)
https://doi.org/10.1063/1.4967343
Published: November 2016
View article titled, Dielectric and magnetic characterizations of capacitor structures with an ionic liquid/MgO barrier and a ferromagnetic Pt electrode
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Journal Articles

Stress-induced large anisotropy field modulation in Ni films deposited on a flexible substrate

R. Asai, S. Ota, T. Namazu, T. Takenobu, T. Koyama, D. Chiba
Journal: Journal of Applied Physics
J. Appl. Phys. 120, 083906 (2016)
https://doi.org/10.1063/1.4961564
Published: August 2016
View article titled, Stress-induced large anisotropy field modulation in Ni films deposited on a flexible substrate
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Journal Articles

Peculiar temperature dependence of electric-field effect on magnetic anisotropy in Co/Pd/MgO system

Y. Hibino, T. Koyama, A. Obinata, T. Hirai, S. Ota, K. Miwa, S. Ono, F. Matsukura, H. Ohno, D. Chiba
Journal: Applied Physics Letters
Appl. Phys. Lett. 109, 082403 (2016)
https://doi.org/10.1063/1.4961621
Published: August 2016
View article titled, Peculiar temperature dependence of electric-field effect on magnetic anisotropy in Co/Pd/MgO system
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Journal Articles

Modulation of the magnetic domain size induced by an electric field

F. Ando, H. Kakizakai, T. Koyama, K. Yamada, M. Kawaguchi, S. Kim, K.-J. Kim, T. Moriyama, D. Chiba, T. Ono
Journal: Applied Physics Letters
Appl. Phys. Lett. 109, 022401 (2016)
https://doi.org/10.1063/1.4955265
Published: July 2016
View article titled, Modulation of the magnetic domain size induced by an electric field
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Journal Articles

Dependence of Curie temperature on Pt layer thickness in Co/Pt system

T. Koyama, A. Obinata, Y. Hibino, A. Hirohata, B. Kuerbanjiang, V. K. Lazarov, D. Chiba
Journal: Applied Physics Letters
Appl. Phys. Lett. 106, 132409 (2015)
https://doi.org/10.1063/1.4916824
Published: April 2015
View article titled, Dependence of Curie temperature on Pt layer thickness in Co/Pt system
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Includes: Supplementary data
Journal Articles

Layer thickness dependence of current induced effective fields in ferromagnetic multilayers

M. Kawaguchi, T. Moriyama, T. Koyama, D. Chiba, T. Ono
Journal: Journal of Applied Physics
Series: Magnetism and Magnetic Materials
J. Appl. Phys. 117, 17C730 (2015)
https://doi.org/10.1063/1.4914897
Published: March 2015
View article titled, Layer thickness dependence of current induced effective fields in ferromagnetic multilayers
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