Observation of the Onset of Magnetic Clustering in Superparamagnetic Zn1−xCoxO Films View Full Text


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Article Info

DATE

2009-09-23

AUTHORS

S. Ye, V. Ney, T. Kammermeier, K. Ollefs, A. Ney, F. Wilhelm, A. Rogalev

ABSTRACT

A series of high quality Zn1−xCoxO thin films were obtained by UHV-magnetron reactive sputtering. Detailed X-ray diffraction, X-ray absorption near edge spectra, and X-ray linear dichroism measurements were used for analyzing the long- and short-range crystalline structure, respectively. These techniques reveal excellent crystalline ordering on both scales for films with oxygen-rich conditions and indicate that Co2+ ions are located on substitutional Zn sites without detectable phase separation. Interestingly, decreasing the structural quality of such Zn1−xCoxO films leads to altered magnetic properties as measured by SQUID magnetometry, ranging from paramagnetism to the emergence of magnetic clustering exhibited by superparamagnetism. In some cases, a small shift of the hysteresis loop is visible after field cooling indicating weak exchange bias typical for the AFM/FM (CoO/Co) system. In the light of detailed structural investigations, the transition regime from paramagnetic to superparamagnetic behavior is discussed. More... »

PAGES

91

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10948-009-0566-6

DOI

http://dx.doi.org/10.1007/s10948-009-0566-6

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1023507504


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