Experimental phase diagram of perpendicularly magnetized ultrathin ferromagnetic films.
We image the domain patterns in perpendicularly magnetized ultrathin Fe films on Cu(100) as a function of the temperature T and the applied magnetic field H. Between the low-field stripe phase and the high-field uniform phase we find a bubble phase, consisting of reversed circular domains in a homogeneous background. The curvature of the transition lines in the H-T parameter space is in contrast to the general expectations. The pattern transformations show yet undetected scaling properties.
Saratz
N
N
Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland.
Lichtenberger
A
A
Portmann
O
O
Ramsperger
U
U
Vindigni
A
A
Pescia
D
D