B11-P-01Magnetocrystalline anisotropy of hexagonal Co by relative intensities of electron magnetic circular dichroic signals

Abstract

Energy integrated signal intensities of Electron Magnetic Circular Dichroism (EMCD) in TEM-EELS (I EMCD ) are proportional to the spin moment of the probed atoms (Mz) projected along the external magnetic field [ 1 ], i.e., I EMCD = KMZ, where the coefficient K depends significantly on the measurement conditions of the EELS detector position on the diffraction plane, sample thickness, convergent/collection angles and I EMCD has not been used to quantitatively compare Mz between different orientations or different materials. We try the quantitative comparison by setting similar measurement conditions for the Co L2,3 EMCD with z//c and zic: The results show clear differences in the EMcD signal intensities, which are fitted with the theoretical curves calculated by the Dyndiff code [ 2 ], relative projected spin moment magnitude (M z┴c / M z//c ) is estimated to be 0.66 ± 0.07, reasonably consistent with 0.75 ± 0.05 from the experimental magnetization curves of a planer shape Co.