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TT: Fachverband Tiefe Temperaturen

TT 14: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)

TT 14.6: Vortrag

Dienstag, 18. März 2025, 10:45–11:00, H18

Manipulating the sign of the interlayer exchange coupling — •Nathan Walker — The Open University, Milton Keynes, UK

We demonstrate, using computer simulations and a non-equilibrium Greens function approach, that the sign of the out-of-equilibrium interlayer exchange coupling (ooeIEC) changes in the presence of an external bias. The system consists of a double barrier connected to an exchange coupled ferromagnetic tri-layer. We find a strongly non-linear dependence of the spin current on voltage which results in the exchange coupled tri-layer switching between parallel and antiparallel configurations. Our results are in excellent agreement with earlier theoretical calculations, which predict an approximately 2π topological phase change of the (equilibrium) IEC. We believe that this could act as an energy efficient mechanism for magnetic switching which does not rely on spin-transfer torque (STT). There are potential applications to magnetoresistive random-access memory (MRAM), one of the principal contenders for a universal memory.

Keywords: Interlayer exchange coupling; Spin current; Magnetic switching