Search

Scanning tunneling microscopy (STM) in liquid was applied in order to prevent the influence of oxidation in air. Using 1,2,4-trichlorobenzene as a liquid for our STM studies, an image of a Cu (001) surface was taken with high reproducibility and an atom image was also obtained. The surface geometry of Cu (001) differently polished from bulk crystals was investigated.

In this study we suggest a new method to prepare an anisotropic bond magnet. In order to achieve an anisotropic magnet we take advantage of the magnetic anisotropy of the tetragonal Nd2Fe14B crystals. A dispersion of a melt spun Nd-Fe-B magnet powder with epoxy resin was hardened in a high frequency (HF) magnetic field (?= 230 kHz) to align the easy magnetization axis (c-axis in Nd2Fe14B) with the external field. Magnetization measurements and an X-ray analysis showed that an alignment of the powder due to the treatment in a HF magnetic field was achieved. A Mößbauer analysis confirmed the alignment.

Ferromagnetic thin films of La2-2xCa1+2xMn2O7(x=0.3) with a tetragonal Sr3Ti2O7-type layered perovskite structure have been deposited on MgO and SrTiO3(001) substrates by magnetron sputtering. The epitaxial thin films in this study have the a-axis normal orientation with 90° domains having the a/cboundaries in the film plane. These thin films exhibit highly enhanced magnetoresistance (MR) effects (MR ratio ??/?0of -93% at µ0H=1 T) compared with those reported for thin films of cubic ferromagnetic perovskite with isotropic Mn-O networks. These MR behavior can be explained by taking account of the two-dimensionality and anisotropy of the Mn-O networks in the ferromagnetic layered perovskites.