Superconductor-altermagnet memory functionality without stray fields

Abstract

A novel class of antiferromagnets, dubbed altermagnets, exhibit a non-relativistically spin-split band structure reminiscent of $d$-wave superconductors, despite the absence of net magnetization. This unique characteristic enables utilization in cryogenic stray-field-free memory devices, offering the possibility of achieving high storage densities. In this Letter, we determine how a proximate altermagnet influences the critical temperature $T_c$ of a conventional $s$-wave singlet superconductor. Considering both a bilayer and trilayer, we show that such hybrid structures may serve as stray-field free memory devices where the critical temperature is controlled by rotating the Néel vector of one altermagnet, providing infinite magnetoresistance. Furthermore, our study reveals that altermagnetism can coexist with superconductivity up to a critical strength of the altermagnetic order as well as robustness of the altermagnetic influence on the conduction electrons against non-magnetic impurities, ensuring the persistence of the proximity effect under realistic experimental conditions.

5 pages, 5 figures

References in corpus (4)

• Antiferromagnetism in RuO${}_2$ as $d$-wave Pomeranchuk instability
• Two-dimensional altermagnets: Superconductivity in a minimal microscopic model
• Effect of Polarized Current on the Magnetic State of Antiferromagnet
• Ultrafast Switching of Antiferromagnets via Spin-transfer Torque

Cited by in corpus (32)

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• Unconventional p-wave and finite-momentum superconductivity induced by altermagnetism through the formation of Bogoliubov Fermi surface
• Theory of Tunneling Spectroscopy in Unconventional $p$-wave Magnet-Superconductor Hybrid Structures
• Tunable second harmornic in altermagnetic Josephson junctions
• Quasiclassical theory of superconducting spin-splitter effects and spin-filtering via altermagnets
• Many-body effects on superconductivity mediated by double-magnon processes in altermagnets
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• Elasto-Hall conductivity and the anomalous Hall effect in altermagnets
• Nonlinear Superconducting Magnetoelectric Effect
• Pair Density Waves and Supercurrent Diode Effect in Altermagnets
• Spin-polarized Specular Andreev Reflections in Altermagnets
• Altermagnetism-Induced Parity Anomaly in Weak Topological Insulators
• Finite-momentum superconductivity in two-dimensional altermagnets with a Rashba-type spin-orbit coupling
• Emergence of tunable exceptional points in altermagnet-ferromagnet junctions
• Adatom engineering magnetic order in superconductors: Applications to altermagnetic superconductivity
• Thermoelectric Effect in Altermagnet-Superconductor Junctions
• Interplay of Altermagnetic Order and Wilson Mass in the Dirac Equation: Helical Edge States without Time-Reversal Symmetry
• Phase-modulated superconductivity via altermagnetism
• Impurity states in altermagnetic superconductors
• Fractionalized Altermagnets: from neighboring and altermagnetic spin-liquids to spin-symmetric band splitting
• Thermodynamic properties of a superconductor interfaced with an altermagnet
• Néel vector controlled exceptional contours in $p$-wave magnet-ferromagnet junctions
• Visualization of spin-splitter effect in altermagnets via non-equilibrium Green functions on a lattice
• Elastic Quantum Criticality in Nematics and Altermagnets via the Elasto-Caloric Effect
• Odd-parity altermagnetism through sublattice currents: From Haldane-Hubbard model to general bipartite lattices
• Engineering subgap states in superconductors by the symmetry of altermagnetism
• Orthogonal Spin-Orbit Torque-Induced Deterministic Switching in NiO
• Josephson effects in the spin-triplet superconductor/altermagnet/spin-triplet superconductor junctions: the detection of the intrinsic $\mathbf{d}$-vector
• Altermagnetism Induced Bogoliubov Fermi Surfaces Form Topological Superconductivity