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arXiv · 2104.06146

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

D. M. Polishchuk·O. I. Nakonechna·Ya. M. Lytvynenko·V. Kuncser·Yu. O. Savina·V. O. Pashchenko·A. F. Kravets·A. I. Tovstolytkin·V. Korenivski
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Abstract

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

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D. M. Polishchuk, O. I. Nakonechna, Ya. M. Lytvynenko, V. Kuncser, Yu. O. Savina, V. O. Pashchenko, A. F. Kravets, A. I. Tovstolytkin, V. Korenivski. 2021-04-13. Temperature and thickness dependent magnetostatic properties of [Fe/Py]/FeMn/Py multilayers. https://doi.org/10.1063/10.0004971

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