TY - JOUR
T1 - Manipulation of perpendicular exchange bias and spin-orbit torques via MgO in Pt/Co/MgO films
AU - Chen, Zhiren
AU - Pan, Chunjiao
AU - Wang, Ning
AU - Qiu, Mingxia
AU - Lin, Tao
AU - Liu, Jing
AU - Li, Shunpu
AU - Han, Peigang
AU - Shi, Ji
AU - Ando, Kazuya
AU - An, Hongyu
N1 - Funding Information:
This work was supported by Natural Science Foundation of Top Talent of SZTU (Grant No. 2019208 ), Foundation and Applied Foundation Research Project of Guangdong Province and the Featured Innovation Project of the Educational Commission of Guangdong Province of China (Grant No. 2019KTSCX203 ). K. A. acknowledges the support by JSPS KAKENHI Grants No. 19H00864 , No. 19K22131 , Canon Foundation, Asahi Glass Foundation, Kao Foundation for Arts and Sciences, JGC-S Scholarship Foundation, and Spintronics Research Network of Japan (Spin-RNJ).
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - We study the perpendicular exchange bias (PEB) and spin-orbit torque (SOT) generation in the Pt/Co/MgO heterostructure by changing the thickness of the MgO layer. We show that the oxidation of the beneath Co layer increases with the MgO thickness. Strong PEB is obtained in the Pt/Co/MgO films, which exhibits a much higher blocking temperature compared with that in the Pt/Co/CoO films. Furthermore, it is found that the MgO thickness has significant effect on the SOT generation. Maximum values of the SOTs are obtained with a 0.8 nm-thick MgO layer, which decreases by increasing the MgO thickness from 0.8 to 1.6 nm. Our results shed a light on the essential role of the MgO layer in the heavy metal/ferromagnet/MgO heterostructure, a typical material system in spintronic devices, and provide a way to manipulate the magnetic properties and the SOTs by oxide layers.
AB - We study the perpendicular exchange bias (PEB) and spin-orbit torque (SOT) generation in the Pt/Co/MgO heterostructure by changing the thickness of the MgO layer. We show that the oxidation of the beneath Co layer increases with the MgO thickness. Strong PEB is obtained in the Pt/Co/MgO films, which exhibits a much higher blocking temperature compared with that in the Pt/Co/CoO films. Furthermore, it is found that the MgO thickness has significant effect on the SOT generation. Maximum values of the SOTs are obtained with a 0.8 nm-thick MgO layer, which decreases by increasing the MgO thickness from 0.8 to 1.6 nm. Our results shed a light on the essential role of the MgO layer in the heavy metal/ferromagnet/MgO heterostructure, a typical material system in spintronic devices, and provide a way to manipulate the magnetic properties and the SOTs by oxide layers.
KW - Co/MgO
KW - Perpendicular exchange bias
KW - Spin-orbit coupling
KW - Spin-orbit torque
KW - Spintronics
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U2 - 10.1016/j.jmmm.2020.166822
DO - 10.1016/j.jmmm.2020.166822
M3 - Article
AN - SCOPUS:85082687460
SN - 0304-8853
VL - 507
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
M1 - 166822
ER -