Reversal asymmetry and anomalous magnetic viscosity in exchange-bias systems

Employing vector magnetometry, interaction plots and model simulations, we probe the magnetization reversal in Co/Cu/IrMn exchange-biased trilayers. In the films with thin or no Cu spacer, the magnetization reversal is governed by domain-wall motion along one branch of the easy-axis hysteresis loop...

Full description

Saved in:
Bibliographic Details
Published in:European physical journal plus 2020-09, Vol.135 (9), p.714, Article 714
Main Authors: Paes, V. Z. C., Lopes, R. F., Geshev, J.
Format: Article
Language:English
Subjects:
Anisotropy
Applied and Technical Physics
Asymmetry
Atomic
Bias
Coherence
Complex Systems
Condensed Matter Physics
Coupling
Domain walls
Exchanging
Ferromagnetism
Hysteresis loops
Magnetic fields
Magnetic measurement
Magnetization reversal
Mathematical and Computational Physics
Molecular
Optical and Plasma Physics
Physics
Physics and Astronomy
Regular Article
Rotation
Simulation
Theoretical
Thin films
Viscosity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Employing vector magnetometry, interaction plots and model simulations, we probe the magnetization reversal in Co/Cu/IrMn exchange-biased trilayers. In the films with thin or no Cu spacer, the magnetization reversal is governed by domain-wall motion along one branch of the easy-axis hysteresis loop and by coherent rotation along the other. For thicker Cu spacers, both magnetization paths are dominated by coherent rotation. The latter also appears to be responsible for the reversal when the magnetic field is applied away from the exchange-bias direction for all films. We reveal a delayed domain-wall reversal along the descending-field path as compared to that predicted for coherent rotation. By exploiting in-field interaction plots, we evidenced a correlation between the asymmetric reversal and the exchange-bias coupling. Anomalous viscosity along recoil curves is detected and attributed to strong ferromagnetic coupling into the ferromagnet. The anomaly tends to fade away with the increase in the bias.
ISSN:2190-5444
2190-5444
DOI:10.1140/epjp/s13360-020-00747-4