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Magnetic irreversibility in VO2/Ni bilayers
J Lauzier1, L Sutton1, J de la Venta1
1Department of Physics, Colorado State University, Fort Collins, CO 80523, United States of America.
Summary
The magnetic coercivity of nickel films on vanadium dioxide (VO2) bilayers changes significantly with temperature-induced VO2 phase transitions. Strain from the VO2 transformation alters nickel
Area of Science:
- Materials Science
- Condensed Matter Physics
- Thin Film Science
Background:
- Vanadium dioxide (VO2) exhibits a metal-insulator transition at around 68°C.
- The structural transformation of VO2 can induce strain in adjacent layers.
- Magnetoelastic effects link mechanical strain to magnetic properties.
Purpose of the Study:
- To investigate the temperature-dependent magnetic properties of VO2/Ni bilayers.
- To understand how the VO2 phase transition affects the coercivity of Ni films.
- To explore the role of strain and phase coexistence in magnetic property modulation.
Main Methods:
- Fabrication of Ni films on both monoclinic and rutile phases of VO2.
- Temperature-dependent magnetic property measurements, focusing on coercivity.
- Cycling experiments to assess the reversibility of magnetic changes.
Main Results:
- Coercivity of Ni films is strongly enhanced near the VO2 transition temperature due to strain.
- Ni deposited on monoclinic VO2 shows enhanced coercivity above the transition, while Ni on rutile VO2 shows suppressed coercivity.
- Reversibility of coercivity changes differs between Ni on rutile VO2 (reversible) and Ni on monoclinic VO2 (irreversible).
Conclusions:
- The inverse magnetoelastic effect significantly modifies Ni coercivity during VO2 phase transitions.
- Phase coexistence during the first-order VO2 transition is linked to coercivity enhancement.
- Irreversibility in Ni on monoclinic VO2 is attributed to VO2 cracking, impacting resistance-temperature behavior.
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