Magnetic relaxation measurements of exchange biased (Pt/Co) multilayers with perpendicular anisotropy - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The European Physical Journal B: Condensed Matter and Complex Systems Année : 2005

Magnetic relaxation measurements of exchange biased (Pt/Co) multilayers with perpendicular anisotropy

Résumé

Magnetic relaxation measurements were carried out by magneto-optical Kerr effect on exchange biased (Pt/Co)5/Pt/FeMn multilayers with perpendicular anisotropy. In these films the coercivity and the exchange bias field vary with Pt spacer thickness, and have a maximum for 0.2 nm. Hysteresis loops do not reveal important differences between the reversal for ascending and descending fields. Relaxation measurements were fitted using Fatuzzo's model, which assumes that reversal occurs by domain nucleation and domain wall propagation. For 2 nm thick Pt spacer (no exchange bias) the reversal is dominated by domain wall propagation starting from a few nucleation centers. For 0.2 nm Pt spacer (maximum exchange bias) the reversal is strongly dominated by nucleation, and no differences between the behaviour of the ascending and descending branches can be observed. For 0.4 nm Pt spacer (weaker exchange bias) the nucleation density becomes less important, and the measurements reveal a much stronger density of nucleation centers in the descending branch.
Fichier principal
Vignette du fichier
relaxationdoi.pdf (426.3 Ko) Télécharger le fichier
Loading...

Dates et versions

hal-00004907 , version 1 (12-05-2005)

Identifiants

Citer

Fabien Romanens, Stefania Pizzini, Jordi Sort, Flavio Garcia, Julio Camarero, et al.. Magnetic relaxation measurements of exchange biased (Pt/Co) multilayers with perpendicular anisotropy. The European Physical Journal B: Condensed Matter and Complex Systems, 2005, 45, pp.185. ⟨10.1140/epjb/e2005-00053-3⟩. ⟨hal-00004907⟩
149 Consultations
100 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More