Cubic Rashba Effect in the Surface Spin Structure of Rare-Earth Ternary Materials

Usachov, Dmitry Yu.; Nechaev, I. A.; Poelchen, Georg; Güttler, M.; Krasovskii, E. E.; Schulz, Susanne; Generalov, A. V.; Kliemt, Kristin; Kraiker, Alexej; Krellner, C.; Kummer, K.; Danzenbächer, S.; Laubschat, C.; Weber, A. P.; Sánchez-Barriga, J.; Chulkov, Eugene V.; Santander-Syro, A. F.; Imai, T.; Miyamoto, Koji; Okuda, Takashi; Vyalikh, D. V.

doi:10.1103/physrevlett.124.237202

Cited by 36 publications

(36 citation statements)

References 40 publications

(41 reference statements)

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“…This indicates a predominant contribution from interfacial effects that we ascribe primarily to Rashba interactions in agreement with the existence of well-defined Rashba 2DEG at the surface of Gd metal [25] and, more generally, in different types of rare-earth compounds. [27,28] We note that similar opposite signs of Rashba splitting have been reported, for example when Cu is replaced by Ag at the interface with Bi. [38,39] As we show in Note S1, such Rashba interactions give rise to spin polarizations and spin currents of both SHE-symmetry and SAHE-symmetry, with only the first generating self-torques.…”

Section: Effsupporting

confidence: 78%

Current‐Induced Spin Torques on Single GdFeCo Magnetic Layers

et al. 2021

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A novel direction of spintronics, namely "spin-orbitronics", exploits the spin-orbit coupling (SOC) to generate spin currents, which can then induce spin-orbit torques (SOT) to manipulate magnetization. [1] This opens technological applications such as the three-terminal magnetic random memory Spintronics exploit spin-orbit coupling (SOC) to generate spin currents, spin torques, and, in the absence of inversion symmetry, Rashba and Dzyaloshinskii-Moriya interactions. The widely used magnetic materials, based on 3d metals such as Fe and Co, possess a small SOC. To circumvent this shortcoming, the common practice has been to utilize the large SOC of nonmagnetic layers of 5d heavy metals (HMs), such as Pt, to generate spin currents and, in turn, exert spin torques on the magnetic layers. Here, a new class of material architectures is introduced, excluding nonmagnetic 5d HMs, for high-performance spintronics operations. Very strong current-induced torques exerted on single ferrimagnetic GdFeCo layers, due to the combination of large SOC of the Gd 5d states and inversion symmetry breaking mainly engineered by interfaces, are demonstrated. These "self-torques" are enhanced around the magnetization compensation temperature and can be tuned by adjusting the spin absorption outside the GdFeCo layer. In other measurements, the very large emission of spin current from GdFeCo, 80% (20%) of spin anomalous Hall effect (spin Hall effect) symmetry is determined. This material platform opens new perspectives to exert "self-torques" on single magnetic layers as well as to generate spin currents from a magnetic layer.

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Section: Effsupporting

confidence: 78%

Current‐Induced Spin Torques on Single GdFeCo Magnetic Layers

et al. 2021

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“…Moreover, the cubic Rashba (CR) and cubic Dresselhaus (CD) spin splittings, with the band dispersion characterized by E k ¼ αk 2 AE τ 0 k 3 , have started to gain attention recently, possibly due to some unique benefits to spin transport [3][4][5][24][25][26][27]. For example, some important experimental discoveries reported CR in, e.g., (001) SrTiO 3 surface [4], Ge/SiGe quantum well [3], SrTiO 3 -based heterostructures [28], and surface states of antiferromagnet TbRh 2 Si 2 [29]. As it will be shown later, the CR effect is usually, by symmetry, mixed with linear in k spin-splitting contributions (note that by mixing we mean that both effects simultaneously exist); consequently, the so far observed CR are mostly based on nonbulk materials (e.g., quantum well, surface, interface) [3,4,28,29].…”

mentioning

confidence: 99%

“…For example, some important experimental discoveries reported CR in, e.g., (001) SrTiO 3 surface [4], Ge/SiGe quantum well [3], SrTiO 3 -based heterostructures [28], and surface states of antiferromagnet TbRh 2 Si 2 [29]. As it will be shown later, the CR effect is usually, by symmetry, mixed with linear in k spin-splitting contributions (note that by mixing we mean that both effects simultaneously exist); consequently, the so far observed CR are mostly based on nonbulk materials (e.g., quantum well, surface, interface) [3,4,28,29]. Focusing on the emerging field of cubic spin splittings, several questions are naturally raised.…”

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confidence: 99%

Purely Cubic Spin Splittings with Persistent Spin Textures

et al. 2020

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Purely cubic spin splittings in the band structure of bulk insulators have not been extensively investigated yet despite the fact that they may pave the way for novel spin-orbitronic applications and can also result in a variety of promising spin phenomena. By symmetry analysis and first-principles simulations, we report symmetry-enforced purely cubic spin splittings (SEPCSS) that can even lead to persistent spin textures. In particular, these SEPCSS can be thought to be complementary to the cubic Rashba and cubic Dresselhaus types of spin splittings. Strikingly, the presently discovered SEPCSS are expected to exist in the large family of materials crystallizing in the 6m2 and 6 point groups, including the Ge

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“…[1][2][3][4][5] Recent photoemission insights into the electronic and magnetic properties of silicide-and rare-earth-terminated surfaces of strongly correlated electron materials of the RET 2 Si 2 family (RE and T are rare-earth and transition-metal atoms, correspondingly) have unveiled novel temperature scales linked with the Kondo interaction, heavy-fermion behavior, mixed-valent properties, and exchange magnetism that are remarkably different to those in the bulk. [6][7][8][9][10][11][12][13][14] Essentially, these studies illustrate that the surfaces of strongly correlated materials with a quasi-2D structure can be viewed as versatile platforms for unveiling novel f-driven phenomena and disentangling the different surface and bulk contributions to the aforementioned many-body effects. This calls for consideration of other classes of strongly correlated materials possessing layered atomic structures like, for example, the CeTIn 5 (T = Co, Rh, Ir) family.…”

Section: Introductionmentioning

confidence: 83%

“…[18,19] The aforementioned RET 2 Si 2 materials, which crystallize in the layered, body-centered tetragonal ThCr 2 Si 2 structure, exhibit a rich diversity of f-driven properties. In order to unravel the surface-related phenomena and respective temperature scales, comprehensive experimental and theoretical studies were performed for the mixed-valent material EuIr 2 Si 2 , [6][7][8] the heavyfermion compounds YbRh 2 Si 2 , [20,21] YbIr 2 Si 2 , [9] and CeRh 2 Si 2 [10] as well as for the antiferromagnets GdIr 2 Si 2 , [11] TbRh 2 Si 2 , [12] GdRh 2 Si 2 , [13] and HoRh 2 Si 2 . [14] Due to their quasi-2D structure, the respective samples can be easily cleaved and examined with surface-sensitive ultra-violet angle-resolved photoelectron spectroscopy (UV-ARPES).…”

Section: Introductionmentioning

confidence: 99%

Strong Rashba Effect and Different f−d Hybridization Phenomena at the Surface of the Heavy‐Fermion Superconductor CeIrIn₅

Mende

Ali

Poelchen

et al. 2021

Adv Elect Materials

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New temperature scales and remarkable differences from bulk properties have increasingly placed the surfaces of strongly correlated f materials into the focus of research activities. Applying first-principles calculations and angle-resolved photoelectron spectroscopy measurements, a strong Rashba effect and spinsplit surface states at the CeIn surface of the heavy-fermion superconductor CeIrIn 5 are revealed. The unveiled 4f-derived electron landscape is remarkably distinct for surface and bulk Ce implying the existence of novel temperature scales near the surface region in this material. These results show that ab initio calculations can reliably predict the unusual electronic and spin structure of surfaces of strongly correlated 4f systems where Rashba spin-orbit-coupling phenomena emerge. It is suggested that the structural blocks of such materials can be combined with magnetically active layers for engineering of novel nanostructural objects with appropriate substrates where the diversity of f-driven properties can be applied for the development of novel functionalities.

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Cubic Rashba Effect in the Surface Spin Structure of Rare-Earth Ternary Materials

Cited by 36 publications

References 40 publications

Current‐Induced Spin Torques on Single GdFeCo Magnetic Layers

Current‐Induced Spin Torques on Single GdFeCo Magnetic Layers

Purely Cubic Spin Splittings with Persistent Spin Textures

Strong Rashba Effect and Different f−d Hybridization Phenomena at the Surface of the Heavy‐Fermion Superconductor CeIrIn₅

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Cubic Rashba Effect in the Surface Spin Structure of Rare-Earth Ternary Materials

Cited by 36 publications

References 40 publications

Current‐Induced Spin Torques on Single GdFeCo Magnetic Layers

Current‐Induced Spin Torques on Single GdFeCo Magnetic Layers

Purely Cubic Spin Splittings with Persistent Spin Textures

Strong Rashba Effect and Different f−d Hybridization Phenomena at the Surface of the Heavy‐Fermion Superconductor CeIrIn5

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Product

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Strong Rashba Effect and Different f−d Hybridization Phenomena at the Surface of the Heavy‐Fermion Superconductor CeIrIn₅