Obtaining strong ferromagnetism in diluted Gd-doped ZnO thin films through controlled Gd-defect complexes

Iman S. Roqan, S. Venkatesh, Zhenkui Zhang, Shahid Hussain, Ioannis Bantounas, J. B. Franklin, Tahani H. Flemban, B. Zou, J.-S. Lee, Udo Schwingenschlögl, P. K. Petrov, M. P. Ryan, N. M. Alford

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

We demonstrate the fabrication of reproducible long-range ferromagnetism (FM) in highly crystalline GdxZn1-xO thin films by controlling the defects. Films are grown on lattice-matched substrates by pulsed laser deposition at low oxygen pressures (≤25 mTorr) and low Gd concentrations (x ≤ 0.009). These films feature strong FM (10 μB per Gd atom) at room temperature. While films deposited at higher oxygen pressure do not exhibit FM, FM is recovered by post-annealing these films under vacuum. These findings reveal the contribution of oxygen deficiency defects to the long-range FM. We demonstrate the possible FM mechanisms, which are confirmed by density functional theory study, and show that Gd dopants are essential for establishing FM that is induced by intrinsic defects in these films.
Original languageEnglish (US)
Pages (from-to)073904
JournalJournal of Applied Physics
Volume117
Issue number7
DOIs
StatePublished - Feb 21 2015

Fingerprint Dive into the research topics of 'Obtaining strong ferromagnetism in diluted Gd-doped ZnO thin films through controlled Gd-defect complexes'. Together they form a unique fingerprint.

Cite this