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The magnetic properties of thin-film multilayers [Fe/Py]/FeMn/Py areinvestigated as a function of temperature and thickness of theantiferromagnetic FeMn spacer using SQUID magnetometry. The observed behaviordiffers substantially for the structures with 6-nm and 15-nm FeMn spacers.While the 15-nm-FeMn structure exhibits exchange pinning of both ferromagneticlayers in the entire measurement temperature interval from 5 to 300 K, the6-nm-FeMn structure becomes exchange de-pinned in the vicinity of roomtemperature. The de-pinned state is characterized by a single hysteresis loopcentered around zero field and having enhanced magnetic coercivity. Theobserved properties are explained in terms of finite-size effects and possiblyferromagnetic interlayer coupling through the thin antiferromagnetic spacer.

Temperature and thickness dependent magnetostatic properties of [Fe/Py]/FeMn/Py multilayers