Above room temperature multiferroic tunnel junction with the altermagnetic metal CrSb

Abstract

Altermagnets with nonrelativistic momentum-dependent spin splitting and compensated net magnetic moments have recently garnered significant interest in spintronics, particularly as pinning layers in magnetic tunnel junctions (MTJs). However, room temperature (RT) altermagnet-based MTJs with tunable tunneling magnetoresistance (TMR) or electroresistance (TER) modulated by multiferroicity remain largely unexplored. Here, we propose an experimentally fabricable above-RT multiferroic MTJ, comprising an altermagnetic metal, ferroelectric barrier, and ferromagnetic metal-epitomized by a CrSb/In2Se3/Fe3GaTe2 heterostructure. Our calculations with first-principles and nonequilibrium Green function method indicate that the architecture enables magnetically switchable TER, electrically tunable TMR, and dual-mode controllable spin filtering. To disentangle the roles of ferroelectricity and the tunnel barrier, nonferroelectric Sb2Se3 and a vacuum gap are exploited as control cases. Remarkably, the system achieves TMR up to 2308%, TER of 707%, and near-perfect spin filtering efficiency. Both TMR and TER are considerable for CrSb/In2Se3/Fe3GaTe2 with either Cr or Sb interface. The transport performance is robust under bias voltage. These findings demonstrate the above-RT multiferroic altermagnet-based MTJs and highlight their exciting potential as a versatile platform for next-generation spin dynamics, magnetic sensing, and quantum logic nanodevices.

36 pages, 7 figures, and 4 tables

References in corpus (21)

• Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
• Crystal Hall effect in Collinear Antiferromagnets
• Multifunctional Antiferromagnetic Materials with Giant Piezomagnetism and Noncollinear Spin Current
• Direct observation of altermagnetic band splitting in CrSb thin films
• Magnetic tunnel junctions with ferroelectric barriers: Prediction of four resistance states from first-principles
• Observation of Giant Band Splitting in Altermagnetic MnTe
• Crystal Thermal Transport in Altermagnetic RuO2
• Large band-splitting in $g$-wave type altermagnet CrSb
• Spin-dependent transport in van der Waals magnetic tunnel junctions with Fe3GeTe2 electrodes
• Antiferroelectric Altermagnets: Antiferroelectricity Alters Magnets
• Ferroelectric switchable altermagnetism
• Three-dimensional mapping of the altermagnetic spin splitting in CrSb
• Absence of altermagnetic spin splitting character in rutile oxide RuO${}_2$
• Van der Waals Multiferroic Tunnel Junctions
• Crystal facet orientated Altermagnets for detecting ferromagnetic and antiferromagnetic states by giant tunneling magnetoresistance effect
• Tremendous tunneling magnetoresistance effects based on van der Waals room-temperature ferromagnet Fe${}_3$GaTe${}_2$ with highly spin-polarized Fermi surfaces
• Intrinsic spin Hall effect in topological insulators: A first-principles study
• First-Principles Study of Two-Dimensional Ferroelectrics Using Self-Consistent Hubbard Parameters
• Stoichiometry-induced ferromagnetism in altermagnetic candidate MnTe
• Chiral spin liquid and quantum phase diagram of spin-$1/2$ $J_1$-$J_2$-$J_{\chi }$ model on the square lattice
• Magnetic order-dependent giant tunneling magnetoresistance and electroresistance in van der Waals antiferromagnetic-multiferroic tunnel junctions

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• Momentum-Resolved Tunneling Modulation Induced Giant Multistate Resistance in Antiferroelectric Multiferroic Junction
• Lithium and Vanadium Intercalation into Bilayer V2Se2O: Ferrimagnetic-Ferroelastic Multiferroics and Anomalous and Spin Transport
• Altermagnetic Flatband-Driven Fermi Surface Geometry for Giant Tunneling Magnetoresistance
• Dimension- and Facet-Dependent Altermagnetic Biferroics and Ferromagnetic Biferroics and Triferroics in CrSb
• Giant Exfoliation Induced Magnetic Coercivity in Fe${}_3$GaTe${}_2$