Magnetic Compton profiles of Fcc-Ni, Fcc-Fe50Ni50 and Hcp-Co

Experimental and theoretical directional magnetic Compton profiles (MCP's) of hcp-Co. fcc-Fe50Ni50 and fcc-Ni are compared with each other to elucidate the difference of the electronic structures of magnetic electrons between fcc-Fe50Ni50 (almost equivalent to fcc-Co) and hcp-Co, and between fcc-Fe50Ni50 and fcc-Ni. Small difference is found experimentally in the former case along the corresponding crystalline axes in a region p(z) < 2 au. The difference is isotropic in shape between these crystals, which can be ascribed to the difference of the spin polarization of mainly s-like electron. In the later case, the experimental main difference is theoretically explained with the d-like 4-th and the d-like 5-th band MCP's. Anisotropies of the MCP in Co are experimentally confirmed for the first time. Limitation of the theoretical calculation based on the single particle approximation is suggested.