Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Сен. 16, 2024

Abstract Recent developments have introduced a groundbreaking form of collinear magnetism known as “altermagnetism”. This emerging magnetic phase is characterized by robust time‐reversal symmetry breaking, antiparallel order, and alternating spin‐splitting band structures, yet it exhibits vanishing net magnetization constrained symmetry. Altermagnetism uniquely integrates traits previously considered mutually exclusive to conventional ferromagnetism antiferromagnetism, thereby facilitating phenomena functionalities not achievable within these traditional categories magnetism. Initially proposed theoretically, the existence altermagnetic has since been corroborated range experimental studies, which confirmed its unique properties potential for applications. review explores rapidly expanding research on altermagnets, emphasizing novel physical they manifest, methodologies inducing altermagnetism, promising materials. The goal this furnish readers with comprehensive overview altermagnetism inspire further innovative studies materials can potentially revolutionize applications in technology science.

Язык: Английский

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Twisted Magnetic Van der Waals Bilayers: An Ideal Platform for Altermagnetism

Physical Review Letters, Год журнала: 2024, Номер 133(20)

Опубликована: Ноя. 15, 2024

We introduce a universal methodology for generating and manipulating altermagnetism in two-dimensional (2D) magnetic Van der Waals (MvdW) materials through twisting. find that key in-plane twofold rotational operation can be achieved twisted bilayer of any 2D MvdW material, which takes one all five Bravais lattices, thereby inducing altermagnetism. By choosing the constituent monolayer with specific symmetry, our approach tailor type, such as d wave, g i wave. Furthermore, properties altermagnetic easily engineered. Taking transition-metal oxyhalide VOBr an example, we by tuning twist angle Fermi level, giant spin Hall obtained, much larger than experimentally reported. This establishes general, robust, adjustable platform to explore provides new efficient way generate manipulate current.Received 16 April 2024Accepted 8 October 2024DOI:https://doi.org/10.1103/PhysRevLett.133.206702© 2024 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasMagnetismPhysical Systems2-dimensional systemsAltermagnetsVan systemsTechniquesDensity functional theoryLinear response theoryTight-binding modelWannier function methodsCondensed Matter, Materials & Applied Physics

Язык: Английский

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Three-dimensional mapping of the altermagnetic spin splitting in CrSb

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Фев. 7, 2025

Altermagnetism, a kind of collinear magnetism that is characterized by momentum-dependent band and spin splitting without net magnetization, has recently attracted considerable interest. Finding altermagnetic materials with large near the Fermi level necessarily requires three-dimensional k-space mapping. While this crucial for spintronic applications emergent phenomena, it remains challenging. Here, using synchrotron-based angle-resolved photoemission spectroscopy (ARPES), spin-resolved ARPES model calculations, we uncover splitting, up to ~1.0 eV, in CrSb. We verify its bulk-type g-wave altermagnetism through systematic mapping, which unambiguously reveals symmetry associated nodal planes. Spin-resolved measurements further polarizations split bands level. Tight-binding analysis indicates arises from strong third-nearest-neighbor hopping mediated Sb ions. The band/spin metallic CrSb, together high TN (up 705 K) simple configuration, paves way exploring phenomena based on altermagnets.

Язык: Английский

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Mirror Chern Bands and Weyl Nodal Loops in Altermagnets

Physical Review Letters, Год журнала: 2025, Номер 134(9)

Опубликована: Март 4, 2025

The electronic spectra of altermagnets are a fertile ground for nontrivial topology due to the unique interplay between time-reversal and crystalline symmetries. This is reflected in unconventional Zeeman splitting bands opposite spins, which emerges absence spin-orbit coupling (SOC) displays nodes along high-symmetry directions. Here, we argue that even small SOC, direction magnetic moments altermagnetic state has profound impact on spectrum, enabling novel topological phenomena appear. By investigating microscopic models two-dimensional (2D) three-dimensional (3D) altermagnets, motivated part by rutile materials, demonstrate emergence hitherto unexplored Dirac crossings same spin but sublattices. determines fate these when SOC turned on. We focus case out-of-plane moments, forbid an anomalous Hall effect thus ensure no weak magnetization triggered state. In 2D model, gaps out crossings, resulting mirror Chern enable Quantum Spin Effect undergo transition trivial upon increasing magnitude moment. On other hand, 3D model persist presence forming Weyl nodal loops protected symmetry. Finally, discuss possible ways control effects material candidates.

Язык: Английский

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Magnetoresistance in 2D Magnetic Materials: From Fundamentals to Applications

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 28, 2025

Abstract Magnetoresistance effects, such as tunnel magnetoresistance and giant magnetoresistance, play pivotal roles in spintronics, where the coupling between spin current affects electrical resistance. These effects are fundamental for various applications, including high‐density information storage, signal transmission, processing. With growing demand magnetoresistance‐based modern devices post‐Moore era, researchers now focusing on developing using 2D magnetic materials. materials offer several advantages, a unique layered structure, high integration density, tunable room‐temperature ferromagnetism, intriguing magnetoresistive properties. This review starts with brief introduction to their typical synthesis routes, followed by preview of some classifications In particular, different applications spintronics critically discussed. Finally, challenges prospects this emerging field suggested. work highlights importance effect advancing technology, offering vital many fields ranging from memory neuromorphic computing.

Язык: Английский

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Altermagnetism: A Chemical Perspective

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Янв. 9, 2025

Altermagnets have been recently introduced as a classification of collinear, spin compensated magnetic materials that host net-zero magnetization yet display some electronic behaviors typically associated with noncompensated like ferromagnets. The emergence such properties are consequence spin-split bands arise under specific symmetry conditions in the limit zero spin–orbit coupling. In this Perspective, we summarize fundamental criteria for realizing an altermagnetic phase and present qualitative band structure derivation analysis through chemical principles. We then discuss make altermagnets distinctive candidates charge-to-spin conversion elements spintronic devices provide brief review candidate materials. Finally, future directions altermagnetism highlight opportunities chemists to advance emerging field.

Язык: Английский

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Description of two-dimensional altermagnetism: Categorization using spin group theory

Physical review. B./Physical review. B, Год журнала: 2024, Номер 110(5)

Опубликована: Авг. 2, 2024

Altermagnetism, recently spotlighted in condensed matter physics, presents captivating physical properties and holds promise for spintronics applications. This study delves into the theoretical description categorization of two-dimensional altermagnetism using spin group theory. Employing spin-group formalism, we establish seven distinct layer groups, extending beyond conventional five Laue to describe altermagnetism. Utilizing these findings, classify previously reported altermagnets identify different materials exhibiting Specifically, monolayer ${\mathrm{MnTeMoO}}_{6}$ ${\mathrm{VP}}_{2}{\mathrm{H}}_{8}{({\mathrm{NO}}_{4})}_{2}$ are predicted be altermagnets. Furthermore, scrutinize their spin-momentum-locking characteristics through symmetry analysis density functional theory calculations, substantiating altermagnetic properties.

Язык: Английский

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Bilayer stacking A -type altermagnet: A general approach to generating two-dimensional altermagnetism

Physical review. B./Physical review. B, Год журнала: 2024, Номер 110(17)

Опубликована: Ноя. 6, 2024

In this article, we propose a new concept of bilayer stacking A-type altermagnet (BSAA), in which two identical ferromagnetic monolayers are stacked with antiferromagnetic coupling to form two-dimensional altermagnet. By solving the model, derive all BSAAs for layer groups and draw three key conclusions: (1) Only 17 can realize intrinsic altermagnetism. All 2D altermagnets must belong these groups, will be helpful search (2) It is impossible connect sublattices BSAA using $S_{3z}$ or $S_{6z}$, constraint that also applicable altermagnets. (3) $C_{2\alpha}$ general operation generate an arbitrary monolayer. Our theory not only explain previously reported twisted-bilayer altermagnets, but provide more possibilities research has significantly broadened range candidate materials Based on conclusion (1), NiZrCl$_6$ predicted exhibit Additionally, use NiCl$_2$, literature, as second example BSAA. Furthermore, utilizing symmetry analysis first-principles calculation, scrutinize their spin-momentum locking characteristic substantiate altermagnetic properties.

Язык: Английский

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Origin of A -type antiferromagnetism and chiral split magnons in altermagnetic α -MnTe

Physical review. B./Physical review. B, Год журнала: 2025, Номер 111(10)

Опубликована: Март 12, 2025

Язык: Английский

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Antiferromagnetism in two-dimensional materials: progress and computational challenges

2D Materials, Год журнала: 2024, Номер 11(3), С. 033005 - 033005

Опубликована: Май 22, 2024

Abstract We present a perspective on the status of antiferromagnetism in two-dimensional (2D) materials. Various types spin-compensated orders are discussed and include non-collinear order, spin spirals altermagnetism. Spin–orbit effects ultimately determine, whether compounds exhibit long range Kosterlitz-Thouless physics, or multiferroic properties we discuss basic magnetic prototypes that may arise 2D materials depending anisotropy ordering vector. A summary antiferromagnets have been characterized experimentally is provided—with particular emphasis anisotropies Neel temperatures. then outline ingredients needed to describe using density functional theory. In particular, systematic determination ground states from generalized Bloch theorem force theorem, which be used calculate excitations Heisenberg model with parameters determined first principles. The methods exemplified by application monolayer helimagnet NiBr 2 . Finally, predicted prospective challenges associated prediction Néel temperatures

Язык: Английский

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