Exchange Bias Coupling Depending on Uniaxial Deposition Field of Antiferromagnetic FeMn Layer

The relationship between ferromagnet anisotropic magnetization and the antiferromagnet atomic spin configuration was investigated for various angles of the uniaxial deposition magnetic field of the FeMn layer in the Corning glass/Ta(5nm)/NiFe(7nm)/FeMn(25nm)/Ta(5nm) multilayer that was prepared by the ion beam sputter deposition. The exchange bias field ($H_ex$) obtained from the measurement of the easy-axis MR loop decreased to 40 Oe at the deposition field angle of $45^\circ$, and to 0 Oe at the angle of $90^\circ$. When the difference between the uniaxial axis between the ferromagnet NiFe and the antiferromagnet FeMn was $90^\circ$, the strong antiferromagnetic dipole moment of FeMn caused the weak ferromagnetic dipole moment of NiFe to rotate in the interface.