Observation of the magnetic domain structures in Cu${}_{0,47}$Ni${}_{0,53}$ thin films at low temperatures

Abstract

We report on the first experimental visualization of domain structure in films of weakly ferromagnetic Cu${}_{0,47}$Ni${}_{0,53}$ alloy with different thickness at liquid helium temperatures. Improved high-resolution Bitter decoration technique was used to map the magnetic contrast on the top of the films well below the Curie temperature T${}_{Curie}$ ($\sim$ 60 K). In contrast to magnetic force microscopy, this technique allowed visualization of the domain structure without its disturbance while the larger areas of the sample were probed. Maze-like domain patterns, typical for perpendicular magnetic anisotropy, were observed. The average domain width was found to be about 100 nm.

4 pages, 5 figures, will be published in JETP Lett

References in corpus (4)

• Proximity effects in superconductor-ferromagnet heterostructures
• Guiding superconducting vortices by magnetic domain walls
• Imaging spontaneous currents in superconducting arrays of pi-junctions
• Depairing currents in superconductor / ferromagnet Nb/CuNi trilayers close to T${}_c$

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