Domain-wall dynamics at micropatterned constrictions in ferromagnetic (Ga ,Mn)As epilayers
Abstract
The influence of sub-μm geometric constrictions on 90° magnetic domain-wall nucleation and propagation in stripes of ferromagnetic (Ga0.95,Mn0.05)As was explored. Measurements of the magnetic switching behavior were performed during ramping of an external magnetic field at constant rate and at constant field in the time domain. Demagnetizing fields are found to play a crucial role in the switching behavior around the region of the constriction. Depending on the sample's initial magnetization the constriction can either assist domain-wall nucleation or hinder its propagation.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- March 2005
- DOI:
- 10.1063/1.1861512
- Bibcode:
- 2005JAP....97f3903H
- Keywords:
-
- 75.50.Pp;
- 75.50.Dd;
- 75.70.Ak;
- 75.70.Kw;
- 75.40.Gb;
- 75.60.Ej;
- 75.30.Gw;
- Magnetic semiconductors;
- Nonmetallic ferromagnetic materials;
- Magnetic properties of monolayers and thin films;
- Domain structure;
- Dynamic properties;
- Magnetization curves hysteresis Barkhausen and related effects;
- Magnetic anisotropy