Room-temperature electric control of exchange bias effect in CoO1-δ/Co films using Pb(Mg1/3Nb2/3)0.7Ti0.3O3 (110) substrates

doi:10.1088/1674-1056/aba611

Abstract Significant electric control of exchange bias effect in a simple CoO_1-δ/Co system, grown on piezoelectric Pb(Mg_1/3Nb_2/3)_0.7Ti_0.3O₃ (110) (PMN-PT) substrates, is achieved at room temperature. Obvious changes in both the coercivity field (H_C) and the exchange bias field (H_E), of 31% and 5%, respectively, have been observed when the electric field is applied to the substrate. While the change of coercivity is related to the enhanced uniaxial anisotropy in the ferromagnetic layer, the change of the exchange bias field can only originate from the spin reorientation in the antiferromagnetic CoO_1-δ layer caused by the strain-induced magnetoelastic effect. A large H_E/H_C > 2, and H_E～ 110 Oe at room temperature, as well as the low-energy fabrication of this system, make it a practical system for spintronic device applications.

Keywords: electric control exchange bias PMN-PT magnetic anisotropy

Received: 08 June 2020
Revised: 03 July 2020
Accepted manuscript online: 15 July 2020

PACS:	85.75.-d	(Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)
	85.75.Dd	(Magnetic memory using magnetic tunnel junctions)
	75.50.-y	(Studies of specific magnetic materials)
	75.30.Gw	(Magnetic anisotropy)

Fund: Project supported by the National Key R&D Program of China (Grant Nos. 2017YFA0206303 and 2017YFA020630) and the National Natural Science Foundation of China (Grant Nos. 11975035 and 51731001).

Corresponding Authors: Rui Wu
E-mail: wurui2010@pku.edu.cn

Cite this article:

Xin Wen(闻馨), Rui Wu(吴锐), Wen-Yun Yang(杨文云), Chang-Sheng Wang(王常生), Shun-Quan Liu(刘顺荃), Jing-Zhi Han(韩景智), Jin-Bo Yang(杨金波) Room-temperature electric control of exchange bias effect in CoO_1-δ/Co films using Pb(Mg_1/3Nb_2/3)_0.7Ti_0.3O₃ (110) substrates 2020 Chin. Phys. B 29 098503

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Room-temperature electric control of exchange bias effect in CoO1-δ/Co films using Pb(Mg1/3Nb2/3)0.7Ti0.3O3 (110) substrates

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Room-temperature electric control of exchange bias effect in CoO_1-δ/Co films using Pb(Mg_1/3Nb_2/3)_0.7Ti_0.3O₃ (110) substrates