ISSN:
1090-6509
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Direct comparative studies are made between the magnetic structures of a surface layer of thickness ∼40 nm and the bulk magnetic structure of ferromagnetic single crystals of hexagonal M ferrites (BaFe12O19, SrFe12O19, PbFe12O19) with a magneto-plumbite structure. Measurements are made by simultaneous gamma, x-ray, and electron Mössbauer spectroscopy in order to investigate the properties of the surface layer and the bulk crystal simultaneously. Experimental data obtained with a depth resolution of ∼ 10 nm show that the orientation of the magnetic moments of the iron ions (along the crystallographic c axis) does not change on approaching the surface from the crystal volume. Thus, to within an experimental error of ∼ 10 nm, single crystals of the hexagonal ferrites BaFe12O19, SrFe12O19, and PbFe12O19 with a ferromagnetic structure do not have a “ transition” surface layer whose magnetic structure differs from that of the bulk crystal such as that which exists, with a depth of several hundred nm, in antiferromagnetic materials with weak ferromagnetism.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1134/1.558212
