Magneto-transport response of flexible FeGa/polyimide structures: insights into domain wall depinning

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Abstract
This work investigates intrinsic coupling between magnetic, magnetostrictive, and magneto-transport responses in flexible Fe 73 Ga 27 /polyimide films. The magnetostriction exhibits a characteristic butterfly behaviour governed primarily by domain rotation processes with a maximum magnetostriction of ∼127 parts per million, indicating strong magnetoelastic coupling. Magnetic hysteresis measurements reveal dominant in-plane anisotropy, which strongly influences the field-dependent electrical transport. Magneto-resistance by four-probe measurements demonstrates well-defined resistance minima ( H K1 , H K2 ), which coincide closely with the magnetic coercive fields ( H c ∼60 Oe (in-plane) & ∼560 Oe (out-of-plane)), demonstrating a direct magnetization-controlled transport mechanism. Temperature-dependent measurements (9–350 K) reveal a monotonic reduction in both magnetic coercivity ( H c ) and characteristic transport fields ( H K1 and H K2 ), suggesting thermally assisted magnetic reversal associated with enhanced domain-wall depinning. The observed one-to-one correspondence between magnetic and electrical responses establishes robust magnetoelastic coupling in flexible Fe 73 Ga 27 /polyimide films, highlighting their suitability for strain-mediated sensing, magnetoelastic transduction, and flexible spintronic applications.
Funding Information
  • Defence Research and Development Organisation (ERIP/IP/202308003/M/01/1835)
  • DST-FIST (SR/FST/PSI-215/2016)
  • Prime Minister Research Fellowship (PMRF ID: 2002217)

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