Confirmation of room temperature ferromagnetism for Mn-doped ZnO micro-tetrapod powders

Z. W. Liu; S. G. Yang; Raju V. Ramanujan; C. K. Ong

doi:10.1016/j.matlet.2007.08.035

Confirmation of room temperature ferromagnetism for Mn-doped ZnO micro-tetrapod powders

Z. W. Liu^*, S. G. Yang, Raju V. Ramanujan, C. K. Ong

^*Corresponding author for this work

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

10 Citations (Scopus)

Abstract

Room temperature ferromagnetism in the Mn-doped ZnO micro-sized tetrapod powders, synthesized by conventional thermal evaporation, has been confirmed by static and dynamic magnetic property measurements on a large scale of bulk composite samples. A saturation magnetization of 0.02 emu/g and a coercivity of 80 Oe were obtained. No Mn or Mn-rich cluster was detected on the tetrapods by XRD and TEM analysis. The permittivity, permeability and reflection loss spectra of the Zn(Mn)O-polymer composites with various Zn(Mn)O contents have been investigated in a wide frequency range. The ferromagnetism was assumed to originate from carrier-mediated exchange coupling in the high surface density tetrapods.

Original language	English
Pages (from-to)	1255-1258
Number of pages	4
Journal	Materials Letters
Volume	62
Issue number	8-9
DOIs	https://doi.org/10.1016/j.matlet.2007.08.035
Publication status	Published - Mar 31 2008
Externally published	Yes

ASJC Scopus Subject Areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Keywords

Magnetic materials
Semiconductors
ZnO

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10.1016/j.matlet.2007.08.035

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title = "Confirmation of room temperature ferromagnetism for Mn-doped ZnO micro-tetrapod powders",

abstract = "Room temperature ferromagnetism in the Mn-doped ZnO micro-sized tetrapod powders, synthesized by conventional thermal evaporation, has been confirmed by static and dynamic magnetic property measurements on a large scale of bulk composite samples. A saturation magnetization of 0.02 emu/g and a coercivity of 80 Oe were obtained. No Mn or Mn-rich cluster was detected on the tetrapods by XRD and TEM analysis. The permittivity, permeability and reflection loss spectra of the Zn(Mn)O-polymer composites with various Zn(Mn)O contents have been investigated in a wide frequency range. The ferromagnetism was assumed to originate from carrier-mediated exchange coupling in the high surface density tetrapods.",

keywords = "Magnetic materials, Semiconductors, ZnO",

author = "Liu, {Z. W.} and Yang, {S. G.} and Ramanujan, {Raju V.} and Ong, {C. K.}",

year = "2008",

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doi = "10.1016/j.matlet.2007.08.035",

language = "English",

volume = "62",

pages = "1255--1258",

journal = "Materials Letters",

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T1 - Confirmation of room temperature ferromagnetism for Mn-doped ZnO micro-tetrapod powders

AU - Liu, Z. W.

AU - Yang, S. G.

AU - Ramanujan, Raju V.

AU - Ong, C. K.

PY - 2008/3/31

Y1 - 2008/3/31

N2 - Room temperature ferromagnetism in the Mn-doped ZnO micro-sized tetrapod powders, synthesized by conventional thermal evaporation, has been confirmed by static and dynamic magnetic property measurements on a large scale of bulk composite samples. A saturation magnetization of 0.02 emu/g and a coercivity of 80 Oe were obtained. No Mn or Mn-rich cluster was detected on the tetrapods by XRD and TEM analysis. The permittivity, permeability and reflection loss spectra of the Zn(Mn)O-polymer composites with various Zn(Mn)O contents have been investigated in a wide frequency range. The ferromagnetism was assumed to originate from carrier-mediated exchange coupling in the high surface density tetrapods.

AB - Room temperature ferromagnetism in the Mn-doped ZnO micro-sized tetrapod powders, synthesized by conventional thermal evaporation, has been confirmed by static and dynamic magnetic property measurements on a large scale of bulk composite samples. A saturation magnetization of 0.02 emu/g and a coercivity of 80 Oe were obtained. No Mn or Mn-rich cluster was detected on the tetrapods by XRD and TEM analysis. The permittivity, permeability and reflection loss spectra of the Zn(Mn)O-polymer composites with various Zn(Mn)O contents have been investigated in a wide frequency range. The ferromagnetism was assumed to originate from carrier-mediated exchange coupling in the high surface density tetrapods.

KW - Magnetic materials

KW - Semiconductors

KW - ZnO

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U2 - 10.1016/j.matlet.2007.08.035

DO - 10.1016/j.matlet.2007.08.035

M3 - Article

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SN - 0167-577X

VL - 62

SP - 1255

EP - 1258

JO - Materials Letters

JF - Materials Letters

IS - 8-9

ER -

Confirmation of room temperature ferromagnetism for Mn-doped ZnO micro-tetrapod powders

Abstract

ASJC Scopus Subject Areas

Keywords

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