Large time-dependent coercivity and resistivity modification under sustained voltage application in a Pt/Co/AlOx/Pt junction.

A. Brink, van den, M.A.J. van der Heijden, H.J.M. Swagten, B. Koopmans

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
156 Downloads (Pure)

Abstract

The coercivity and resistivity of a Pt/Co/AlOx/Pt junction are measured under sustained voltage application. High bias voltages of either polarity are determined to cause a strongly enhanced, reversible coercivity modification compared to low voltages. Time-resolved measurements show a logarithmic development of the coercive field in this regime, which continues over a period as long as 30 min. Furthermore, the resistance of the dielectric barrier is found to change strongly and reversibly on the same time scale, suggesting an electrochemical process is taking place within the dielectric. It is argued that the migration of oxygen vacancies at the magnet/oxide interface could explain both the resistance variation and the enhanced electric field effect at high voltages. A thermal fluctuation aftereffect model is applied to account for the observed logarithmic dependence.
Original languageEnglish
Pages (from-to)17c717-1/4
Number of pages4
JournalJournal of Applied Physics
Volume117
DOIs
Publication statusPublished - 3 Mar 2015

Fingerprint

Dive into the research topics of 'Large time-dependent coercivity and resistivity modification under sustained voltage application in a Pt/Co/AlOx/Pt junction.'. Together they form a unique fingerprint.

Cite this