Magnetic and magnetoresistive properties of Fe10Ni90/Tb–Co films with modified interlayer interface

• Hysteresis properties of Fe10Ni90 layer as part of Fe10Ni90/TbCo were investigated.
• Influence of the introduction of the Ti spacers of different thicknesses was studied.
• Influence of temperature on hysteresis properties of Fe10Ni90 layer was analyzed.
• Magnetization mechanism for bilayers separated by different Ti spacers was analyzed.

Hysteresis properties and magnetization processes in exchange coupled Fe10Ni90/Tb27Co73 bilayers separated by ultrathin Ti spacers of different thicknesses were investigated in temperature range from 79 to 450 K. Magnetization process in most samples with exchange bias took place by magnetization rotation. Exchange bias field decreased monotonously with thickness of Ti spacer increasing while coercivity had a distinguished maximum at critical value of exchange bias disappearance. Exchange bias field was shown to decrease almost linear with temperature increasing until the irreversible fall to zero at blocking temperature, demonstrating very similar behavior for bilayers with ultrathin Ti spacer of different thicknesses.