Transport across junctions of altermagnets with normal metals and ferromagnets

Abstract

Altermagnet (AM) is a novel time reversal symmetry broken magnetic phase with $d$-wave order which has been experimentally realized recently. We discuss theoretical models of altermagnet based systems on lattice and in continuum. We show equivalence between the lattice and continuum models by mapping the respective parameters. We study (i) altermagnet-normal metal (NM) and (ii) altermagnet-ferromagnet (FM) junctions, with the aim to quantify transport properties such as conductivity and magnetoresistance. We find that a spin current accompanies charge current when a bias is applied. The magnetoresistance of AM-FM junction switches sign when AM is rotated by $90^{\circ }$ -- a feature unique to the altermagnetic phase.

7 pages, 5 captioned figures

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Cited by in corpus (23)

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• Altermagnetism in the layered intercalated transition metal dichalcogenide CoNb${}_4$Se${}_8$
• Crossed Andreev reflection in altermagnets
• Impurity-induced Friedel oscillations in altermagnets and $p$-wave magnets
• Anisotropic spin filtering by an altermagnetic barrier in magnetic tunnel junctions
• Interface-induced magnetization in altermagnets and antiferromagnets
• Crossed Andreev reflection in collinear $p$-wave magnet/triplet superconductor junctions
• Quantum transport theory for unconventional magnets: Interplay of altermagnetism and p-wave magnetism with superconductivity
• Transverse Spin current at the normal/p-wave magnet junctions
• Emergence of tunable exceptional points in altermagnet-ferromagnet junctions
• Light-induced charge and spin Hall currents in materials with $C_{4}K$ symmetry
• Crossover from relativistic to non-relativistic net magnetization for MnTe altermagnet candidate
• Interplay between altermagnetism and topological superconductivity on an unconventional superconducting platform
• Andreev bound states and supercurrent in an unconventional superconductor-altermagnetic Josephson junction
• Magnetic impurities in an altermagnetic metal
• Néel vector controlled exceptional contours in $p$-wave magnet-ferromagnet junctions
• Altermagnetism, ARPES, symmetry, non-relativistic band splitting
• Magnetization symmetry for the MnTe altermagnetic candidate
• Orientation dependent anomalous Hall and spin Hall currents at junctions of altermagnets with $p$-wave magnets
• Tuning spin currents in collinear antiferromagnets and altermagnets
• Néel vector controlled charge and spin transport in altermagnetic junctions
• Josephson diode and spin-valve effects on the surface of altermagnet CrSb