Structural, chemical and magnetic properties of secondary phases in Co-doped ZnO

A Ney; András Kovács; V Ney; S Ye; K Ollefs; T Kammermeier; F Wilhelm; A Rogalev; Rafal E. Dunin-Borkowski

doi:10.1088/1367-2630/13/10/103001

Structural, chemical and magnetic properties of secondary phases in Co-doped ZnO

A Ney, András Kovács, V Ney, S Ye, K Ollefs, T Kammermeier, F Wilhelm, A Rogalev, Rafal E. Dunin-Borkowski

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Abstract

We have utilized a comprehensive set of experimental techniques such as transmission electron microscopy (TEM) and synchrotron-based x-ray absorption spectroscopy (XAS) and the respective x-ray linear dichroism and x-ray magnetic circular dichroism to characterize the correlation of structural, chemical and magnetic properties of Co-doped ZnO samples. It can be established on a quantitative basis that the superparamagnetic (SPM) behavior observed by integral superconducting quantum interference device magnetometry is not an intrinsic property of the material but stems from precipitations of metallic Co. Their presence is revealed by TEM as well as XAS. Annealing procedures for these SPM samples were also studied, and the observed changes in the magnetic properties found to be due to a chemical reduction or oxidation of the metallic Co species.

Original language	English
Journal	New Journal of Physics
Volume	13
Issue number	10
Pages (from-to)	103001
ISSN	1367-2630
DOIs	https://doi.org/10.1088/1367-2630/13/10/103001
Publication status	Published - 2011

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title = "Structural, chemical and magnetic properties of secondary phases in Co-doped ZnO",

abstract = "We have utilized a comprehensive set of experimental techniques such as transmission electron microscopy (TEM) and synchrotron-based x-ray absorption spectroscopy (XAS) and the respective x-ray linear dichroism and x-ray magnetic circular dichroism to characterize the correlation of structural, chemical and magnetic properties of Co-doped ZnO samples. It can be established on a quantitative basis that the superparamagnetic (SPM) behavior observed by integral superconducting quantum interference device magnetometry is not an intrinsic property of the material but stems from precipitations of metallic Co. Their presence is revealed by TEM as well as XAS. Annealing procedures for these SPM samples were also studied, and the observed changes in the magnetic properties found to be due to a chemical reduction or oxidation of the metallic Co species.",

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note = "Third parties have the same rights to reuse articles in NJP as described in the Creative Commons Attribution-Non-Commercial-ShareAlike 3.0 license. These open-access rights allow third-party users to copy, distribute and display the published version of articles in NJP, and create derivative works, subject to appropriate attribution and non-commercial exploitation. ",

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AU - Ney, A

AU - Kovács, András

AU - Ney, V

AU - Ye, S

AU - Ollefs, K

AU - Kammermeier, T

AU - Wilhelm, F

AU - Rogalev, A

AU - Dunin-Borkowski, Rafal E.

N1 - Third parties have the same rights to reuse articles in NJP as described in the Creative Commons Attribution-Non-Commercial-ShareAlike 3.0 license. These open-access rights allow third-party users to copy, distribute and display the published version of articles in NJP, and create derivative works, subject to appropriate attribution and non-commercial exploitation.

PY - 2011

Y1 - 2011

N2 - We have utilized a comprehensive set of experimental techniques such as transmission electron microscopy (TEM) and synchrotron-based x-ray absorption spectroscopy (XAS) and the respective x-ray linear dichroism and x-ray magnetic circular dichroism to characterize the correlation of structural, chemical and magnetic properties of Co-doped ZnO samples. It can be established on a quantitative basis that the superparamagnetic (SPM) behavior observed by integral superconducting quantum interference device magnetometry is not an intrinsic property of the material but stems from precipitations of metallic Co. Their presence is revealed by TEM as well as XAS. Annealing procedures for these SPM samples were also studied, and the observed changes in the magnetic properties found to be due to a chemical reduction or oxidation of the metallic Co species.

AB - We have utilized a comprehensive set of experimental techniques such as transmission electron microscopy (TEM) and synchrotron-based x-ray absorption spectroscopy (XAS) and the respective x-ray linear dichroism and x-ray magnetic circular dichroism to characterize the correlation of structural, chemical and magnetic properties of Co-doped ZnO samples. It can be established on a quantitative basis that the superparamagnetic (SPM) behavior observed by integral superconducting quantum interference device magnetometry is not an intrinsic property of the material but stems from precipitations of metallic Co. Their presence is revealed by TEM as well as XAS. Annealing procedures for these SPM samples were also studied, and the observed changes in the magnetic properties found to be due to a chemical reduction or oxidation of the metallic Co species.

U2 - 10.1088/1367-2630/13/10/103001

DO - 10.1088/1367-2630/13/10/103001

M3 - Journal article

SN - 1367-2630

VL - 13

SP - 103001

JO - New Journal of Physics

JF - New Journal of Physics

IS - 10

ER -

Structural, chemical and magnetic properties of secondary phases in Co-doped ZnO

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