Positive exchange bias of EuO1−x films

Bingqian Song; Mingchang Wang; Xianjie Wang; Yu Sui; Jinke Tang

doi:10.1016/j.jmmm.2019.165900

Positive exchange bias of EuO_1−x films

Bingqian Song
, Mingchang Wang
, Xianjie Wang^*
, Yu Sui
, Jinke Tang

^*Corresponding author for this work

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

3 Scopus citations

Abstract

We have investigated the magnetic properties of oxygen-deficient europium monoxide EuO_1−x films prepared on (0 0 1)-orientation Si single crystal substrate via laser-MBE. Stoichiometric EuO and reduced EuO_1−x films are deposited by adjusting the annealing conditions of Si wafers pre-deposition. An enhanced Curie temperature (T_C) from 69 K to 150 K is observed by introducing oxygen vacancies to EuO, which is due to the formation of magnetic polarons. The EuO_1−x films exhibit positive exchange bias when the films enter the Heisenberg ferromagnetic phase at a lower temperature, which suggests that an antiferromagnetic coupling between the magnetic polarons and Eu²⁺ 4f spins which is ordered in the typical Heisenberg ferromagnet.

Original language	English
Article number	165900
Journal	Journal of Magnetism and Magnetic Materials
Volume	496
DOIs	https://doi.org/10.1016/j.jmmm.2019.165900
State	Published - 15 Feb 2020
Externally published	Yes

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10.1016/j.jmmm.2019.165900

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@article{68309d803e9f4a89b4dd29d08e1fdf8f,

title = "Positive exchange bias of EuO1−x films",

abstract = "We have investigated the magnetic properties of oxygen-deficient europium monoxide EuO1−x films prepared on (0 0 1)-orientation Si single crystal substrate via laser-MBE. Stoichiometric EuO and reduced EuO1−x films are deposited by adjusting the annealing conditions of Si wafers pre-deposition. An enhanced Curie temperature (TC) from 69 K to 150 K is observed by introducing oxygen vacancies to EuO, which is due to the formation of magnetic polarons. The EuO1−x films exhibit positive exchange bias when the films enter the Heisenberg ferromagnetic phase at a lower temperature, which suggests that an antiferromagnetic coupling between the magnetic polarons and Eu2+ 4f spins which is ordered in the typical Heisenberg ferromagnet.",

author = "Bingqian Song and Mingchang Wang and Xianjie Wang and Yu Sui and Jinke Tang",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2020",

month = feb,

day = "15",

doi = "10.1016/j.jmmm.2019.165900",

language = "英语",

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journal = "Journal of Magnetism and Magnetic Materials",

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publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Positive exchange bias of EuO1−x films

AU - Song, Bingqian

AU - Wang, Mingchang

AU - Wang, Xianjie

AU - Sui, Yu

AU - Tang, Jinke

PY - 2020/2/15

Y1 - 2020/2/15

N2 - We have investigated the magnetic properties of oxygen-deficient europium monoxide EuO1−x films prepared on (0 0 1)-orientation Si single crystal substrate via laser-MBE. Stoichiometric EuO and reduced EuO1−x films are deposited by adjusting the annealing conditions of Si wafers pre-deposition. An enhanced Curie temperature (TC) from 69 K to 150 K is observed by introducing oxygen vacancies to EuO, which is due to the formation of magnetic polarons. The EuO1−x films exhibit positive exchange bias when the films enter the Heisenberg ferromagnetic phase at a lower temperature, which suggests that an antiferromagnetic coupling between the magnetic polarons and Eu2+ 4f spins which is ordered in the typical Heisenberg ferromagnet.

AB - We have investigated the magnetic properties of oxygen-deficient europium monoxide EuO1−x films prepared on (0 0 1)-orientation Si single crystal substrate via laser-MBE. Stoichiometric EuO and reduced EuO1−x films are deposited by adjusting the annealing conditions of Si wafers pre-deposition. An enhanced Curie temperature (TC) from 69 K to 150 K is observed by introducing oxygen vacancies to EuO, which is due to the formation of magnetic polarons. The EuO1−x films exhibit positive exchange bias when the films enter the Heisenberg ferromagnetic phase at a lower temperature, which suggests that an antiferromagnetic coupling between the magnetic polarons and Eu2+ 4f spins which is ordered in the typical Heisenberg ferromagnet.

UR - https://www.scopus.com/pages/publications/85072982839

U2 - 10.1016/j.jmmm.2019.165900

DO - 10.1016/j.jmmm.2019.165900

M3 - 文章

AN - SCOPUS:85072982839

SN - 0304-8853

VL - 496

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

M1 - 165900

ER -

Positive exchange bias of EuO_1−x films

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