Recovery and nonrecovery of the untrained state in an exchange-coupled system

Jaru Jutimoosik, Rattikorn Yimnirun, Annette Setzer, Pablo Esquinazi, Jochen Stahn, Amitesh Paul*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We report depth sensitive investigations of the magnetic interaction between exchange-coupled stacked CoO and ferromagnetic Co bilayers (separated by thick Au layers) as we explore the degree of recovery of the untrained state after the first two field cycles. Such a recovery is expected by field cycling a reorientation field (HRE) along a direction (ΩRE) away from the initial field cooling direction. Measurements as a function of ΩRE and the strength of HRE (along each direction) map the influence of ΩRE on the reversal mechanism in the layers and thereby the degree of recovery. Our results are consistent with the earlier observations in similar systems that was realized with ΩRE=90. We ascribe these partial and/or significant recoveries to the unchanged sense of rotation after initial field cooling of the ferromagnetic magnetization upon each field cycling. Furthermore, in our system, we find that this recovery can be regulated by choosing various other HRE and ΩRE values without changing the rotational sense. The best recipe for recovery is identified for ΩRE=45, that can be achieved partially with HRE=3.0 kOe and remain significant even with HRE=10.0 kOe. In this study we not only understand the fundamental mechanism in the recovery of training, but also instigate its technological prospects by lifting the directional restrictions of the reorientation field.

Original languageEnglish
Article number224428
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number22
DOIs
StatePublished - 25 Jun 2015
Externally publishedYes

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