Tunneling anisotropic magnetoresistance driven by magnetic phase transition

Abstract

The independent control of two magnetic electrodes and spin-coherent transport in magnetic tunnel junctions are strictly required for tunneling magnetoresistance, while junctions with only one ferromagnetic electrode exhibit tunneling anisotropic magnetoresistance dependent on the anisotropic density of states with no room temperature performance so far. Here we report an alternative approach to obtaining tunneling anisotropic magnetoresistance in alfa-FeRh-based junctions driven by the magnetic phase transition of alfa-FeRh and resultantly large variation of the density of states in the vicinity of MgO tunneling barrier, referred to as phase transition tunneling anisotropic magnetoresistance. The junctions with only one alfa-FeRh magnetic electrode show a magnetoresistance ratio up to 20% at room temperature. Both the polarity and magnitude of the phase transition tunneling anisotropic magnetoresistance can be modulated by interfacial engineering at the alfa-FeRh/MgO interface. Besides the fundamental significance, our finding might add a different dimension to magnetic random access memory and antiferromagnet spintronics.

25 pages, 5 figures, accepted by Nature Communications

References in corpus (9)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Recent progress in voltage control of magnetism: Materials, mechanisms, and performance
• Tunneling anisotropic magnetoresistance and spin-orbit coupling in Fe/GaAs/Au tunnel junctions
• Tunneling anisotropic magnetoresistance driven by resonant surface states: First-principles calculations of Fe(001) surface
• Full Electroresistance Modulation in a Mixed-Phase Metallic Alloy
• Tunneling anisotropic magnetoresistance in multilayer-(Co/Pt)/AlOx/Pt structures
• Reversal of spin polarization in Fe/GaAs (001) driven by resonant surface states: First-principles calculations
• Revealing the Hidden Structural Phases of FeRh
• Competing magnetic states, disorder, and the magnetic character of Fe3Ga4

Cited by in corpus (5)

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• Large magnetoresistance in an electric field controlled antiferromagnetic tunnel junction
• Electrical-controllable antiferromagnet-based tunnel junction
• Non-thermal electrons open the non-equilibrium pathway of the phase transition in FeRh