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

Authors

• Aswini K. Pradhan, Center for Materials Research, Norfolk State UniversityFollow
• Kai Zhang, Center for Materials Research, Norfolk State University, Virginia
• S. Mohanty, Center for Materials Research, Norfolk State University, Virginia
• J.B. Dadson, Center for Materials Research, Norfolk State University, Virginia
• D. Hunter, Center for Materials Research, Norfolk State University, Virginia
• Jun Zhang, University of Nebraska - LincolnFollow
• David J. Sellmyer, University of Nebraska-LincolnFollow
• U.N. Roy, Department of Physics, Fisk University, Nashville, Tennessee
• Y. Cui, Department of Physics, Fisk University, Nashville, Tennessee
• A. Burger, Department of Physics, Fisk University, Nashville, Tennessee
• S. Mathews, Institute of Physics, Sachivalaya Marg, Orissa, India
• B. Joseph, Institute of Physics, Sachivalaya Marg, Orissa, India
• B.R. Sekhar, Institute of Physics, Sachivalaya Marg, Orissa, India
• B.K. Roul, Institute of Physics, Sachivalaya Marg, Orissa, India

Document Type

Article

Date of this Version

4-11-2005

Comments

Published by American Institute of Physics. Appl. Phys. Lett. 86, 152511 (2005). ©2005 American Institute of Physics. Permission to use. http://apl.aip.org/jap/.

Abstract

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.