Spin-split collinear antiferromagnets: A large-scale ab-initio study

Guo, Yaqian; Liu, Hui; Janson, Oleg; Fulga, Ion Cosma; Brink, Jeroen van den; Facio, Jorge I.

doi:10.1016/j.mtphys.2023.100991

Cited by 14 publications

(9 citation statements)

References 112 publications

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“…These spin-polarized band structures are analogous to these in ferromagnet, and thus the spinpolarized currents may appear. These differ from the band structures in altermagnets that have the altermagnetic collinear spin polarization in momentum space [11][12][13][14][15]. When J = 1, the subbands overlap, and thus spin degenerate states dominate the transmission (figure 2(a)), resulting in nearly spin unpolarized transport.…”

Section: Resultsmentioning

confidence: 89%

“…The giant and tunneling magnetoresistance effects as well as the spin-transfer torque are the most significant effects driven by the spin-polarized currents. Recently, it was discovered that AFs with non-spin-degenerate band structures can generate spin-polarized currents efficiently [5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Gurung et al [6] predicted that the noncollinear antiferromagnetic antiperovskites ANMn 3 can support highly spin-polarized currents.…”

Section: Introductionmentioning

confidence: 99%

“…Collinear AFs, on the other hand, are typically symmetrical under simultaneous time reversal and lattice translation or simultaneous space inversion-time reversal, and their symmetries rule out the spin-polarized current. When these symmetries are broken, it was recently discovered that unconventional collinear AFs known as altermagnets break the spin degeneracy in momentum space [11][12][13][14][15]. For example, Šmejkal et al [11] proposed that giant and tunneling magnetoresistance can be realized in the unconventional collinear AFs.…”

Section: Introductionmentioning

confidence: 99%

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Electrically controllable spin polarization in collinear antiferromagnetic junctions

Niu

Wen

2023

J. Phys. D: Appl. Phys.

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Antiferromagnetic spintronics is a rapidly growing subfield of spintronics in condensed-matter physics and information technology. Electrical current in collinear antiferromagnetic materials is typically spin unpolarized, limiting the realization of antiferromagnetic spintronics effects. Here we study the transport in the collinear antiferromagnetic junctions by applying a transverse electric field $E_y$ to the antiferromagnets. The band structures of the collinear antiferromagnets may become spin-polarized when the combined time reversal and lattice translation symmetry is broken by $E_y$. The separation between spin-up and spin-down bands is controlled by $E_y$.Full spin polarization originating from spin-polarized states near the band gap's edges is observed at high exchange energy. In particular, as $E_y$ increases, the region capable of generating high spin polarization broadensdue to the increased separation between spin-up and spin-down bands. The amplitude and sign of spin polarization can be controlled by $E_y$. These characteristics indicate that collinear antiferromagnet materials are ideal for future spintronics applications.

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Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrically controllable spin polarization in collinear antiferromagnetic junctions

Niu

Wen

2023

J. Phys. D: Appl. Phys.

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“…This compound belongs to the non‐interconvertible prototype illustrated in Figure 1c and will show the SOC‐independent spin splitting. Isostructural antiferromagnets, such as MnF 2, [ 4a ] RuO 2 , [ 12b,22 ] and CoF 2 , [ 4b,23 ] reported to show SOC‐independent spin splitting, also contains a similar non‐interconvertible spin‐structure motif pair. DFT results of these representative example materials are shown in Figure S3 (Supporting Information), which agree well with the symmetry and motif description.…”

Section: Illustration Of the Motif‐based Rule In Real Materialsmentioning

confidence: 99%

Degeneracy Removal of Spin Bands in Collinear Antiferromagnets with Non‐Interconvertible Spin‐Structure Motif Pair

Yuan

Zunger

2023

Advanced Materials

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Energy bands in antiferromagnets are supposed to be spin degenerate in the absence of spin–orbit coupling (SOC). Recent studies have identified formal symmetry conditions for antiferromagnetic crystals in which this degeneracy can be lifted, spin splitting,even in the vanishing SOC (i.e., non‐relativistic) limit. Materials having such symmetries could enable spin‐split antiferromagnetic spintronics without the burden of using heavy‐atom compounds. However, the symmetry conditions that involve spin and magnetic symmetry are not always effective as practical material selection filters. Furthermore, these symmetry conditions do not readily disclose trends in the magnitude and momentum dependence of the spin‐splitting energy. Here, it is shown that the formal symmetry conditions enabling spin‐split antiferromagnets can be interpreted in terms of local motif pairs, such as octahedra or tetrahedra, each carrying opposite magnetic moments. Collinear antiferromagnets with such a spin‐structure motif pair, whose components interconvert by neither translation nor spatial inversion, will show spin splitting. Such a real‐space motif‐based approach enables an easy way to identify and design materials (illustrated in real example materials) having spin splitting without the need for SOC, and offers insights into the momentum dependence and magnitude of the spin splitting.

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“…13,15 Therefore, it is observable for some determined space groups and even more precisely, in the magnetic space groups of type-I and type-III. 16 If the system is metallic, the AM systems can exhibit spontaneous anomalous Hall effects (AHE) even in the absence of net magnetic moment due to the presence of a non-relativistic spin-splitting in the momentum space. 17,18 The direction of the Hall vector is governed by the Néel vector defined as the difference between the magnetization vectors on the two different antiferromagnetic sublattices.…”

Section: Introductionmentioning

confidence: 99%

Altermagnetic surface states: towards the observation and utilization of altermagnetism in thin films, interfaces and topological materials

Sattigeri,

Cuono,

Autieri

2023

Nanoscale

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Spin-split collinear antiferromagnets: A large-scale ab-initio study

Cited by 14 publications

References 112 publications

Electrically controllable spin polarization in collinear antiferromagnetic junctions

Electrically controllable spin polarization in collinear antiferromagnetic junctions

Degeneracy Removal of Spin Bands in Collinear Antiferromagnets with Non‐Interconvertible Spin‐Structure Motif Pair

Altermagnetic surface states: towards the observation and utilization of altermagnetism in thin films, interfaces and topological materials

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