Probing defect driven tunable spontaneous magnetization in paramagnetic Zn0.95Co0.05O epitaxial films by X-ray absorption investigations

P. Satyarthi; S. Ghosh; Y. T. Wang; S. Zhou; P. Kumar; D. Kanjilal; L. Olivi; D. Bürger; I. Skorupa; H. Schmidt; P. Srivastava

doi:10.1016/j.jallcom.2015.07.218

Probing defect driven tunable spontaneous magnetization in paramagnetic Zn_0.95Co_0.05O epitaxial films by X-ray absorption investigations

P. Satyarthi, S. Ghosh, Y. T. Wang, S. Zhou, P. Kumar, D. Kanjilal, L. Olivi, D. Bürger, I. Skorupa, H. Schmidt, P. Srivastava

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

5 Scopus citations

Abstract

In order to address existing unresolved issues related to intrinsic and extrinsic origins of ferromagnetism in Zn_1-xCo_xO based diluted magnetic semiconductors for varying x, the present work aims to investigate the tunable ferromagnetism triggered in paramagnetic Zn_0.95Co_0.05O films using 500 KeV inert xenon ion irradiation of different fluences. The origin of ferromagnetism in post irradiated Zn_0.95Co_0.05O films is understood from different densities of bound magnetic polarons (BMPs) formation through correlated spins of tetrahedrally substituted Co²⁺ ions and anionic vacancies. The alteration in crystallographic positions of Zn, Co cations, and O anions in the tetrahedral environment as analyzed from Zn and Co K-edgeX-ray absorption and O 1s photoemission is a crucial factor for the stabilization of different density of BMPs. Magnetic field and temperature dependence of X-ray magnetic circular dichroism at the Co L_2,3 edge provide experimental evidence of purely paramagnetic contribution from well localized Co²⁺ ions of Co sublattice for paramagnetic Zn_0.95Co_0.05O film. The paramagnetic Co²⁺ ions of Co sublattice persist in irradiated films, which reveal BMPs formation as the origin of ferromagnetism.

Original language	English
Pages (from-to)	891-898
Number of pages	8
Journal	Journal of Alloys and Compounds
Volume	649
DOIs	https://doi.org/10.1016/j.jallcom.2015.07.218
State	Published - 3 Aug 2015
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

Funding

The authors acknowledge Elettra (Italy), UE46/PGM-1 of BESSY II (Berlin), and IIT Delhi (India) for providing synchrotron radiation and XPS facilities to carry out the electronic structure measurements. The experimental work at HZDR was financially supported by the Helmholtz-Gemeinschaft Deutscher Forschungszentren ( HGF-VH-NG-713 ). In addition, financial support from Deutsche Forschungsgemeinschaft ( Bu 2956/1-1, SCHM1663/4-1 ) and Department of Science and Technology (DST), India ( Grant number - INT/ITALY/P-13/2012 (SP-PhT.1/89) ) to carry out this work is gratefully acknowledged. One of the authors (P. Satyarthi) is thankful to University Grant Commission (UGC) ( 20-12/2009(ii)EU-IV ), India for the financial support through fellowship.

Funders	Funder number
Helmholtz-Gemeinschaft Deutscher Forschungszentren	HGF-VH-NG-713
University Grant Commission
Deutsche Forschungsgemeinschaft	SCHM1663/4-1, Bu 2956/1-1
Department of Science and Technology, Government of Kerala	- INT/ITALY/P-13/2012, SP-PhT.1/89

Keywords

Diluted magnetic semiconductors
Spintronics
X-ray absorption

Access to Document

10.1016/j.jallcom.2015.07.218

Cite this

Satyarthi, P., Ghosh, S., Wang, Y. T., Zhou, S., Kumar, P., Kanjilal, D., Olivi, L., Bürger, D., Skorupa, I., Schmidt, H., & Srivastava, P. (2015). Probing defect driven tunable spontaneous magnetization in paramagnetic Zn_0.95Co_0.05O epitaxial films by X-ray absorption investigations. Journal of Alloys and Compounds, 649, 891-898. https://doi.org/10.1016/j.jallcom.2015.07.218

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abstract = "In order to address existing unresolved issues related to intrinsic and extrinsic origins of ferromagnetism in Zn1-xCoxO based diluted magnetic semiconductors for varying x, the present work aims to investigate the tunable ferromagnetism triggered in paramagnetic Zn0.95Co0.05O films using 500 KeV inert xenon ion irradiation of different fluences. The origin of ferromagnetism in post irradiated Zn0.95Co0.05O films is understood from different densities of bound magnetic polarons (BMPs) formation through correlated spins of tetrahedrally substituted Co2+ ions and anionic vacancies. The alteration in crystallographic positions of Zn, Co cations, and O anions in the tetrahedral environment as analyzed from Zn and Co K-edgeX-ray absorption and O 1s photoemission is a crucial factor for the stabilization of different density of BMPs. Magnetic field and temperature dependence of X-ray magnetic circular dichroism at the Co L2,3 edge provide experimental evidence of purely paramagnetic contribution from well localized Co2+ ions of Co sublattice for paramagnetic Zn0.95Co0.05O film. The paramagnetic Co2+ ions of Co sublattice persist in irradiated films, which reveal BMPs formation as the origin of ferromagnetism.",

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author = "P. Satyarthi and S. Ghosh and Wang, {Y. T.} and S. Zhou and P. Kumar and D. Kanjilal and L. Olivi and D. B{\"u}rger and I. Skorupa and H. Schmidt and P. Srivastava",

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Satyarthi, P, Ghosh, S, Wang, YT, Zhou, S, Kumar, P, Kanjilal, D, Olivi, L, Bürger, D, Skorupa, I, Schmidt, H & Srivastava, P 2015, 'Probing defect driven tunable spontaneous magnetization in paramagnetic Zn_0.95Co_0.05O epitaxial films by X-ray absorption investigations', Journal of Alloys and Compounds, vol. 649, pp. 891-898. https://doi.org/10.1016/j.jallcom.2015.07.218

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T1 - Probing defect driven tunable spontaneous magnetization in paramagnetic Zn0.95Co0.05O epitaxial films by X-ray absorption investigations

AU - Satyarthi, P.

AU - Ghosh, S.

AU - Wang, Y. T.

AU - Zhou, S.

AU - Kumar, P.

AU - Kanjilal, D.

AU - Olivi, L.

AU - Bürger, D.

AU - Skorupa, I.

AU - Schmidt, H.

AU - Srivastava, P.

PY - 2015/8/3

Y1 - 2015/8/3

N2 - In order to address existing unresolved issues related to intrinsic and extrinsic origins of ferromagnetism in Zn1-xCoxO based diluted magnetic semiconductors for varying x, the present work aims to investigate the tunable ferromagnetism triggered in paramagnetic Zn0.95Co0.05O films using 500 KeV inert xenon ion irradiation of different fluences. The origin of ferromagnetism in post irradiated Zn0.95Co0.05O films is understood from different densities of bound magnetic polarons (BMPs) formation through correlated spins of tetrahedrally substituted Co2+ ions and anionic vacancies. The alteration in crystallographic positions of Zn, Co cations, and O anions in the tetrahedral environment as analyzed from Zn and Co K-edgeX-ray absorption and O 1s photoemission is a crucial factor for the stabilization of different density of BMPs. Magnetic field and temperature dependence of X-ray magnetic circular dichroism at the Co L2,3 edge provide experimental evidence of purely paramagnetic contribution from well localized Co2+ ions of Co sublattice for paramagnetic Zn0.95Co0.05O film. The paramagnetic Co2+ ions of Co sublattice persist in irradiated films, which reveal BMPs formation as the origin of ferromagnetism.

AB - In order to address existing unresolved issues related to intrinsic and extrinsic origins of ferromagnetism in Zn1-xCoxO based diluted magnetic semiconductors for varying x, the present work aims to investigate the tunable ferromagnetism triggered in paramagnetic Zn0.95Co0.05O films using 500 KeV inert xenon ion irradiation of different fluences. The origin of ferromagnetism in post irradiated Zn0.95Co0.05O films is understood from different densities of bound magnetic polarons (BMPs) formation through correlated spins of tetrahedrally substituted Co2+ ions and anionic vacancies. The alteration in crystallographic positions of Zn, Co cations, and O anions in the tetrahedral environment as analyzed from Zn and Co K-edgeX-ray absorption and O 1s photoemission is a crucial factor for the stabilization of different density of BMPs. Magnetic field and temperature dependence of X-ray magnetic circular dichroism at the Co L2,3 edge provide experimental evidence of purely paramagnetic contribution from well localized Co2+ ions of Co sublattice for paramagnetic Zn0.95Co0.05O film. The paramagnetic Co2+ ions of Co sublattice persist in irradiated films, which reveal BMPs formation as the origin of ferromagnetism.

KW - Diluted magnetic semiconductors

KW - Spintronics

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