Tuning ferromagnetism in Mgx Zn1-x O thin films by band gap and defect engineering

Yongfeng Li; Rui Deng; Bin Yao; Guozhong Xing; Dandan Wang; Tom Wu

doi:10.1063/1.3485058

Tuning ferromagnetism in Mg_x Zn_1-x O thin films by band gap and defect engineering

Yongfeng Li^*, Rui Deng, Bin Yao, Guozhong Xing, Dandan Wang, Tom Wu

^*Corresponding author for this work

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

98 Scopus citations

Abstract

We investigate the room temperature ferromagnetism in band gap tunable Mg_x Zn_1-x O (x≤0.22) alloy thin films and find that ferromagnetism is significantly enhanced in p-type Mg_xZn _1-x O (x≤0.17) compared with the n-type counterparts (x≤0.15). Temperature-dependent photoluminescence measurements reveal the correlation between the p-type behavior, enhanced ferromagnetism, and zinc vacancies. First-principle calculations demonstrate that the formation energy of zinc vacancies decreases with the increasing Mg content and the zinc vacancies in Mg_x Zn_1-x O alloys stabilize the ferromagnetic coupling. Our results suggest a viable route to tune the magnetic properties of oxides through band gap and defect engineering.

Original language	English (US)
Article number	102506
Journal	Applied Physics Letters
Volume	97
Issue number	10
DOIs	https://doi.org/10.1063/1.3485058
State	Published - Sep 6 2010
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Tuning ferromagnetism in Mgx Zn1-x O thin films by band gap and defect engineering",

abstract = "We investigate the room temperature ferromagnetism in band gap tunable Mgx Zn1-x O (x≤0.22) alloy thin films and find that ferromagnetism is significantly enhanced in p-type MgxZn 1-x O (x≤0.17) compared with the n-type counterparts (x≤0.15). Temperature-dependent photoluminescence measurements reveal the correlation between the p-type behavior, enhanced ferromagnetism, and zinc vacancies. First-principle calculations demonstrate that the formation energy of zinc vacancies decreases with the increasing Mg content and the zinc vacancies in Mgx Zn1-x O alloys stabilize the ferromagnetic coupling. Our results suggest a viable route to tune the magnetic properties of oxides through band gap and defect engineering.",

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T1 - Tuning ferromagnetism in Mgx Zn1-x O thin films by band gap and defect engineering

AU - Li, Yongfeng

AU - Deng, Rui

AU - Yao, Bin

AU - Xing, Guozhong

AU - Wang, Dandan

AU - Wu, Tom

PY - 2010/9/6

Y1 - 2010/9/6

N2 - We investigate the room temperature ferromagnetism in band gap tunable Mgx Zn1-x O (x≤0.22) alloy thin films and find that ferromagnetism is significantly enhanced in p-type MgxZn 1-x O (x≤0.17) compared with the n-type counterparts (x≤0.15). Temperature-dependent photoluminescence measurements reveal the correlation between the p-type behavior, enhanced ferromagnetism, and zinc vacancies. First-principle calculations demonstrate that the formation energy of zinc vacancies decreases with the increasing Mg content and the zinc vacancies in Mgx Zn1-x O alloys stabilize the ferromagnetic coupling. Our results suggest a viable route to tune the magnetic properties of oxides through band gap and defect engineering.

AB - We investigate the room temperature ferromagnetism in band gap tunable Mgx Zn1-x O (x≤0.22) alloy thin films and find that ferromagnetism is significantly enhanced in p-type MgxZn 1-x O (x≤0.17) compared with the n-type counterparts (x≤0.15). Temperature-dependent photoluminescence measurements reveal the correlation between the p-type behavior, enhanced ferromagnetism, and zinc vacancies. First-principle calculations demonstrate that the formation energy of zinc vacancies decreases with the increasing Mg content and the zinc vacancies in Mgx Zn1-x O alloys stabilize the ferromagnetic coupling. Our results suggest a viable route to tune the magnetic properties of oxides through band gap and defect engineering.

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Tuning ferromagnetism in Mg_x Zn_1-x O thin films by band gap and defect engineering

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