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Study of Weak Ferromagnetism in Zn[sub 1-x]Co[sub x]O

Kh. T. IgamberdievcInstitute of Heat and Mass Transfer, 15P. Brouki, Minsk 220072, BelarusSh. U. YuldashevbDepartment of Thermophysics, Uzbekistan Academy of Sciences, Tashkent, UzbekistanYounghae KwonbDepartment of Thermophysics, Uzbekistan Academy of Sciences, Tashkent, UzbekistanT. W. KangaQuantum‐Functional Semiconductor Research Center, Dongguk University, Seoul 100‐715, KoreaVasiliy PelenovichcInstitute of Heat and Mass Transfer, 15P. Brouki, Minsk 220072, BelarusA. G. ShashkovbDepartment of Thermophysics, Uzbekistan Academy of Sciences, Tashkent, UzbekistanJisoon IhmHyeonsik Cheong

AIP conference proceedingsjournal2011en

ABI

Annotatsiya

The temperature dependencies of the magnetization and the thermal diffusivity of Zn1‐xCoxO have been conducted. Zn1‐xCoxO (x = 0.03) thin films were deposited on Si (100) substrates by using ultrasonic spray pyrolysis. Magnetization M(H) measurements show a hysteresis loop which indicates an existence of ferromagnetism in Zn0.97Co0.03O. However, the magnetic moment per Co ion is much lower than expected. A comparison of M(T) measured at zero‐field‐cooled (ZFC) and field‐cooled (FC) conditions shows a superparamagnetic like behavior and the blocking temperature is about 130K. Temperature dependence of the thermal diffusivity of Zn0.97Co0.03O shows a pronounced λ shaped minimum at 130K, which indicates an existence of a second‐order phase transition at this temperature. The low value of the phase transition entropy shows that only a small part of Co ions is involved in ferromagnetic ordering.

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Mavzular

ZnO doping and properties Magnetic and transport properties of perovskites and related materials Copper-based nanomaterials and applications

Identifikatorlar

DOI: 10.1063/1.3666574

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