High-temperature ferromagnetism in pulsed-laser deposited epitaxial (Zn,Mn)O thin films: Effects of substrate temperature

Pradhan, A. K.; Kai Zhang; Mohanty, S.; Dadson, J. B.; Hunter, D.; Zhang, Jun; Sellmyer, D. J.; Roy, U. N.; Cui, Y.; Burger, A.; Mathews, S.; Joseph, B.; Sekhar, B. R.; Roul, B. K.
April 2005
Applied Physics Letters;4/11/2005, Vol. 86 Issue 15, p152511
Academic Journal
We report on the observation of remarkable room-temperature ferromagnetism in epitaxial (Zn,Mn)O films grown by a pulsed-laser deposition technique using high-density targets. The optimum growth conditions were demonstrated from x-ray measurements, microstructure, Rutherford backscattering, micro-Raman, and magnetic studies. Superior ferromagnetic properties were observed in (Zn,Mn)O films grown at a substrate temperature of 500 °C and with an oxygen partial pressure of 1 mTorr. Ferromagnetism becomes weaker with increasing substrate temperature due to the formation of isolated Mn clusters irrespective of higher crystalline quality of the film.


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