Journal
ADVANCED MATERIALS INTERFACES
Volume 10, Issue 12, Pages -Publisher
WILEY
DOI: 10.1002/admi.202202487
Keywords
flexible magnetic films; stretchable FeRh films; wrinkle morphology
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In this work, stretchable magnetic films with controllable stretchability and high temperature growth were fabricated by growing metamagnetic FeRh films on mica substrates and transferring them onto prestrained PDMS. The wrinkle pattern formed after releasing the prestrain enables a controllable stretchability of the FeRh films. The meta-magnetic phase transition temperature can be effectively controlled by the prestrain, and the flexible FeRh films maintain stable performance after thousands of stretches.
Stretchable magnetic materials are highly desirable for developing flexible high-performance magnetoelectronic devices. However, it is still challenge to fabricate stretchable magnetic films with high growth temperature. In this work, metamagnetic FeRh films are grown on mica substrates at high temperature and then transferred onto the prestrained polydimethylsiloxane (PDMS). Due to the large modulus mismatch between FeRh films and PDMS, FeRh films with periodic wrinkle pattern is formed after releasing the prestrain, enabling a controllable stretchability up to a few tens of percent. Moreover, the meta-magnetic phase transition temperature can be effectively controlled by the prestrain, with an increase of approximate to 4 K for every 10% increase in the prestrain. In case of the applied tensile strain less than the prestrain, the obtained flexible FeRh films can maintain stable performance after thousands of stretches, making it promising for applications in flexible magnetoelectronic devices.
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