Effects of Interfacial Oxidization on Magnetic Damping and Spin-Orbit Torques

Dongjoon Lee; Wonmin Jeong; Deokhyun Yun; Seung Young Park; Byeong Kwon Ju; Kyung Jin Lee; Byoung Chul Min; Hyun Cheol Koo; Oukjae Lee

doi:10.1021/acsami.1c00608

Effects of Interfacial Oxidization on Magnetic Damping and Spin-Orbit Torques

Dongjoon Lee, Wonmin Jeong, Deokhyun Yun, Seung Young Park, Byeong Kwon Ju, Kyung Jin Lee, Byoung Chul Min, Hyun Cheol Koo, Oukjae Lee

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

10 Citations (Scopus)

Abstract

We investigate the effects of interfacial oxidation on the perpendicular magnetic anisotropy, magnetic damping, and spin-orbit torques in heavy-metal (Pt)/ferromagnet (Co or NiFe)/capping (MgO/Ta, HfOx, or TaN) structures. At room temperature, the capping materials influence the effective surface magnetic anisotropy energy density, which is associated with the formation of interfacial magnetic oxides. The magnetic damping parameter of Co is considerably influenced by the capping material (especially MgO) while that of NiFe is not. This is possibly due to extra magnetic damping via spin-pumping process across the Co/CoO interface and incoherent magnon generation (spin fluctuation) developed in the antiferromagnetic CoO. It is also observed that both antidamping and field-like spin-orbit torque efficiencies vary with the capping material in the thickness ranges we examined. Our results reveal the crucial role of interfacial oxides on the perpendicular magnetic anisotropy, magnetic damping, and spin-orbit torques.

Original language	English
Pages (from-to)	19414-19421
Number of pages	8
Journal	ACS Applied Materials and Interfaces
Volume	13
Issue number	16
DOIs	https://doi.org/10.1021/acsami.1c00608
Publication status	Published - 2021 Apr 28

Bibliographical note

Funding Information:
This work was supported by the National Research Council of Science & Technology (NST) grant (No. CAP-16-01-KIST) and the KIST Institutional Program. This work was partly supported by the Institute of Information & Communications Technology Planning & Evaluation (IITP) grant funded by the Korean government (MSIT) (No. 2019-0-00296). K.-J.L. was supported by the National Research Foundation of Korea (NRF) [NRF-2020R1A2C3013302] and KU-KIST School Project. Experimental data in a is obtained from KBSI SQUID VSM.

Publisher Copyright:
©

Keywords

Gilbert damping
interfacial magnetic oxide
magnetic resonance
spin-Hall effect
spin-orbit torque
spintronics

ASJC Scopus subject areas

General Materials Science

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10.1021/acsami.1c00608

Cite this

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title = "Effects of Interfacial Oxidization on Magnetic Damping and Spin-Orbit Torques",

abstract = "We investigate the effects of interfacial oxidation on the perpendicular magnetic anisotropy, magnetic damping, and spin-orbit torques in heavy-metal (Pt)/ferromagnet (Co or NiFe)/capping (MgO/Ta, HfOx, or TaN) structures. At room temperature, the capping materials influence the effective surface magnetic anisotropy energy density, which is associated with the formation of interfacial magnetic oxides. The magnetic damping parameter of Co is considerably influenced by the capping material (especially MgO) while that of NiFe is not. This is possibly due to extra magnetic damping via spin-pumping process across the Co/CoO interface and incoherent magnon generation (spin fluctuation) developed in the antiferromagnetic CoO. It is also observed that both antidamping and field-like spin-orbit torque efficiencies vary with the capping material in the thickness ranges we examined. Our results reveal the crucial role of interfacial oxides on the perpendicular magnetic anisotropy, magnetic damping, and spin-orbit torques. ",

keywords = "Gilbert damping, interfacial magnetic oxide, magnetic resonance, spin-Hall effect, spin-orbit torque, spintronics",

author = "Dongjoon Lee and Wonmin Jeong and Deokhyun Yun and Park, {Seung Young} and Ju, {Byeong Kwon} and Lee, {Kyung Jin} and Min, {Byoung Chul} and Koo, {Hyun Cheol} and Oukjae Lee",

note = "Funding Information: This work was supported by the National Research Council of Science & Technology (NST) grant (No. CAP-16-01-KIST) and the KIST Institutional Program. This work was partly supported by the Institute of Information & Communications Technology Planning & Evaluation (IITP) grant funded by the Korean government (MSIT) (No. 2019-0-00296). K.-J.L. was supported by the National Research Foundation of Korea (NRF) [NRF-2020R1A2C3013302] and KU-KIST School Project. Experimental data in a is obtained from KBSI SQUID VSM. Publisher Copyright: {\textcopyright} ",

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AU - Lee, Dongjoon

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AU - Ju, Byeong Kwon

AU - Lee, Kyung Jin

AU - Min, Byoung Chul

AU - Koo, Hyun Cheol

AU - Lee, Oukjae

N1 - Funding Information: This work was supported by the National Research Council of Science & Technology (NST) grant (No. CAP-16-01-KIST) and the KIST Institutional Program. This work was partly supported by the Institute of Information & Communications Technology Planning & Evaluation (IITP) grant funded by the Korean government (MSIT) (No. 2019-0-00296). K.-J.L. was supported by the National Research Foundation of Korea (NRF) [NRF-2020R1A2C3013302] and KU-KIST School Project. Experimental data in a is obtained from KBSI SQUID VSM. Publisher Copyright: ©

PY - 2021/4/28

Y1 - 2021/4/28

N2 - We investigate the effects of interfacial oxidation on the perpendicular magnetic anisotropy, magnetic damping, and spin-orbit torques in heavy-metal (Pt)/ferromagnet (Co or NiFe)/capping (MgO/Ta, HfOx, or TaN) structures. At room temperature, the capping materials influence the effective surface magnetic anisotropy energy density, which is associated with the formation of interfacial magnetic oxides. The magnetic damping parameter of Co is considerably influenced by the capping material (especially MgO) while that of NiFe is not. This is possibly due to extra magnetic damping via spin-pumping process across the Co/CoO interface and incoherent magnon generation (spin fluctuation) developed in the antiferromagnetic CoO. It is also observed that both antidamping and field-like spin-orbit torque efficiencies vary with the capping material in the thickness ranges we examined. Our results reveal the crucial role of interfacial oxides on the perpendicular magnetic anisotropy, magnetic damping, and spin-orbit torques.

AB - We investigate the effects of interfacial oxidation on the perpendicular magnetic anisotropy, magnetic damping, and spin-orbit torques in heavy-metal (Pt)/ferromagnet (Co or NiFe)/capping (MgO/Ta, HfOx, or TaN) structures. At room temperature, the capping materials influence the effective surface magnetic anisotropy energy density, which is associated with the formation of interfacial magnetic oxides. The magnetic damping parameter of Co is considerably influenced by the capping material (especially MgO) while that of NiFe is not. This is possibly due to extra magnetic damping via spin-pumping process across the Co/CoO interface and incoherent magnon generation (spin fluctuation) developed in the antiferromagnetic CoO. It is also observed that both antidamping and field-like spin-orbit torque efficiencies vary with the capping material in the thickness ranges we examined. Our results reveal the crucial role of interfacial oxides on the perpendicular magnetic anisotropy, magnetic damping, and spin-orbit torques.

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KW - interfacial magnetic oxide

KW - magnetic resonance

KW - spin-Hall effect

KW - spin-orbit torque

KW - spintronics

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JF - ACS Applied Materials and Interfaces

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ER -

Effects of Interfacial Oxidization on Magnetic Damping and Spin-Orbit Torques

Abstract

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