A study of the origin of weak ferromagnetism in Zn1-xCO xO

S. H.U. Yuldashev; H. C. Jeon; Y. H. Kwon; S. J. Lee; T. W. Kang; Kh T. Igamberdiev

doi:10.1007/s11837-013-0789-7

A study of the origin of weak ferromagnetism in Zn_1-xCO _xO

S. H.U. Yuldashev, H. C. Jeon, Y. H. Kwon, S. J. Lee, T. W. Kang, Kh T. Igamberdiev

Dongguk University

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

3 Scopus citations

Abstract

To study the origin of ferromagnetism in Zn_1-xCo_xO thin films, its thermal diffusivity, in addition to its magnetization measurements, were analyzed. Thin films of Zn_1-xCo_xO (x = 0.03) were deposited on Si (100) substrates through ultrasonic spray pyrolysis. Magnetization M(B) measurements at low temperature showed a hysteresis loop that indicated the existence of ferromagnetic ordering in Zn_0.97Co _0.03O. However, the magnetic moment per Co ion was much lower than expected. A comparison of M(T) measured at zero-field-cooled and field-cooled conditions showed a superparamagnetic-like behavior, with a blocking temperature of about 130 K. Temperature dependence on the thermal diffusivity of Zn _0.97Co_0.03O showed a pronounced lambda-shaped minimum at 130 K, which indicated the existence of a second-order phase transition at this temperature. The weak ferromagnetism in the Zn_0.97Co_0.03O with the Curie temperature of 130 K was ascribed to the uncompensated magnetic moment at the surface of CoO nanoclusters.

Original language	English
Pages (from-to)	78-81
Number of pages	4
Journal	JOM
Volume	66
Issue number	1
DOIs	https://doi.org/10.1007/s11837-013-0789-7
State	Published - Jan 2014

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title = "A study of the origin of weak ferromagnetism in Zn1-xCO xO",

abstract = "To study the origin of ferromagnetism in Zn1-xCoxO thin films, its thermal diffusivity, in addition to its magnetization measurements, were analyzed. Thin films of Zn1-xCoxO (x = 0.03) were deposited on Si (100) substrates through ultrasonic spray pyrolysis. Magnetization M(B) measurements at low temperature showed a hysteresis loop that indicated the existence of ferromagnetic ordering in Zn0.97Co 0.03O. However, the magnetic moment per Co ion was much lower than expected. A comparison of M(T) measured at zero-field-cooled and field-cooled conditions showed a superparamagnetic-like behavior, with a blocking temperature of about 130 K. Temperature dependence on the thermal diffusivity of Zn 0.97Co0.03O showed a pronounced lambda-shaped minimum at 130 K, which indicated the existence of a second-order phase transition at this temperature. The weak ferromagnetism in the Zn0.97Co0.03O with the Curie temperature of 130 K was ascribed to the uncompensated magnetic moment at the surface of CoO nanoclusters.",

author = "Yuldashev, {S. H.U.} and Jeon, {H. C.} and Kwon, {Y. H.} and Lee, {S. J.} and Kang, {T. W.} and Igamberdiev, {Kh T.}",

year = "2014",

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doi = "10.1007/s11837-013-0789-7",

language = "English",

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AU - Yuldashev, S. H.U.

AU - Jeon, H. C.

AU - Kwon, Y. H.

AU - Lee, S. J.

AU - Kang, T. W.

AU - Igamberdiev, Kh T.

PY - 2014/1

Y1 - 2014/1

N2 - To study the origin of ferromagnetism in Zn1-xCoxO thin films, its thermal diffusivity, in addition to its magnetization measurements, were analyzed. Thin films of Zn1-xCoxO (x = 0.03) were deposited on Si (100) substrates through ultrasonic spray pyrolysis. Magnetization M(B) measurements at low temperature showed a hysteresis loop that indicated the existence of ferromagnetic ordering in Zn0.97Co 0.03O. However, the magnetic moment per Co ion was much lower than expected. A comparison of M(T) measured at zero-field-cooled and field-cooled conditions showed a superparamagnetic-like behavior, with a blocking temperature of about 130 K. Temperature dependence on the thermal diffusivity of Zn 0.97Co0.03O showed a pronounced lambda-shaped minimum at 130 K, which indicated the existence of a second-order phase transition at this temperature. The weak ferromagnetism in the Zn0.97Co0.03O with the Curie temperature of 130 K was ascribed to the uncompensated magnetic moment at the surface of CoO nanoclusters.

AB - To study the origin of ferromagnetism in Zn1-xCoxO thin films, its thermal diffusivity, in addition to its magnetization measurements, were analyzed. Thin films of Zn1-xCoxO (x = 0.03) were deposited on Si (100) substrates through ultrasonic spray pyrolysis. Magnetization M(B) measurements at low temperature showed a hysteresis loop that indicated the existence of ferromagnetic ordering in Zn0.97Co 0.03O. However, the magnetic moment per Co ion was much lower than expected. A comparison of M(T) measured at zero-field-cooled and field-cooled conditions showed a superparamagnetic-like behavior, with a blocking temperature of about 130 K. Temperature dependence on the thermal diffusivity of Zn 0.97Co0.03O showed a pronounced lambda-shaped minimum at 130 K, which indicated the existence of a second-order phase transition at this temperature. The weak ferromagnetism in the Zn0.97Co0.03O with the Curie temperature of 130 K was ascribed to the uncompensated magnetic moment at the surface of CoO nanoclusters.

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VL - 66

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A study of the origin of weak ferromagnetism in Zn_1-xCO _xO

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