Observation of unconventional anomalous Hall effect in epitaxial CrTe thin films

Zhao, Dapeng; Zhang, Liguo; Malik, Iftikhar Ahmed; Liao, Menghan; Cui, Wenqiang; Cai, Xinqiang; Zheng, Cheng; Li, Luxin; Hu, Xiaopeng; Zhang, Ding; Zhang, Jinxing; Chen, Xi; Jiang, Wanjun; Xue, Qi‐Kun

doi:10.1007/s12274-017-1913-8

Cited by 81 publications

(68 citation statements)

References 34 publications

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“…There are various stable stoichiometries reported for chromium chalcogenides [e.g., CrTe 23,24 , Cr 2 Te 3 25,26 , and Cr 5 Te 8 27,28 ] depending on the Cr vacancies that occur in intercalation. However, none of them belongs to layered compounds with interlayer vdW gap, except for CrTe 2 .…”

Section: Resultsmentioning

confidence: 99%

Room-temperature intrinsic ferromagnetism in epitaxial CrTe2 ultrathin films

et al. 2021

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While the discovery of two-dimensional (2D) magnets opens the door for fundamental physics and next-generation spintronics, it is technically challenging to achieve the room-temperature ferromagnetic (FM) order in a way compatible with potential device applications. Here, we report the growth and properties of single- and few-layer CrTe2, a van der Waals (vdW) material, on bilayer graphene by molecular beam epitaxy (MBE). Intrinsic ferromagnetism with a Curie temperature (TC) up to 300 K, an atomic magnetic moment of ~0.21 $${\mu }_{{\rm{B}}}$$ μ B /Cr and perpendicular magnetic anisotropy (PMA) constant (Ku) of 4.89 × 105 erg/cm3 at room temperature in these few-monolayer films have been unambiguously evidenced by superconducting quantum interference device and X-ray magnetic circular dichroism. This intrinsic ferromagnetism has also been identified by the splitting of majority and minority band dispersions with ~0.2 eV at Г point using angle-resolved photoemission spectroscopy. The FM order is preserved with the film thickness down to a monolayer (TC ~ 200 K), benefiting from the strong PMA and weak interlayer coupling. The successful MBE growth of 2D FM CrTe2 films with room-temperature ferromagnetism opens a new avenue for developing large-scale 2D magnet-based spintronics devices.

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Section: Resultsmentioning

confidence: 99%

Room-temperature intrinsic ferromagnetism in epitaxial CrTe2 ultrathin films

et al. 2021

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“…The spin-orbit coupling in the magnetic system generates the anomalous Hall effect (AHE) associated with the Berry curvature in momentum space [2]. The noncoplanar magnetic texture could have a chiral real space configuration of the local moments, which have unique geometrical or topological properties in real space leading to the topological Hall effect (THE) [3][4][5][6][7][8][9][10][11][12][13][14][15]. THE is usually observed in mainly three families of materials, such as the chiral magnetic B20 compounds (MnSi, FeGe, Fe 1−x Co x Si, etc.)…”

mentioning

confidence: 99%

“…THE is usually observed in mainly three families of materials, such as the chiral magnetic B20 compounds (MnSi, FeGe, Fe 1−x Co x Si, etc.) with broken inversion symmetry [8,[16][17][18][19][20], the metallic ferromagnet/paramagnet bilayers with artificial Dzyaloshinsky-Moriya (DM) interactions at the interface [9][10][11]21], and magnetically doped topological insulators [12,22]. The THE is a signature of the chiral magnetic texture, i.e.…”

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confidence: 99%

Topological Hall Effect in Traditional Ferromagnet Embedded with Black-Phosphorus-Like Bismuth Nanosheets

Zhou

Chen

et al. 2020

ACS Appl. Mater. Interfaces

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We implement the molecular beam epitaxy method to embed the black-phosphorus-like bismuth nanosheets into the bulk ferromagnet Cr2Te3. As a typical surfactant, bismuth lowers the surface tensions and mediates the layer-by-layer growth of Cr2Te3. Meanwhile, the bismuth atoms precipitate into black-phosphorus-like nanosheets with the lateral size of several tens of nanometers. In Cr2Te3 embedded with Bi-nanosheets, we observe simultaneously a large topological Hall effect together with the magnetic susceptibility plateau and magnetoresistivity anomaly. As a control experiment, none of these signals is observed in the pristine Cr2Te3 samples. Therefore, the Bi-nanosheets serve as seeds of topological Hall effect induced by non-coplanar magnetic textures planted into Cr2Te3. Our experiments demonstrate a new method to generates a large topological Hall effect by planting strong spin-orbit couplings into the traditional ferromagnet, which may have potential applications in spintronics.

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“…Recent theoretical calculation demonstrated that layered Cr x Te y hold promises for 2D ferromagnetic materials. [ 192 ] More and more Cr x Te y have been prepared and proved to be 2D ferromagnetic with metallic conductivity, including Cr 0.62 Te, [ 193 ] CrTe, [ 173 ] CrTe 2 , [ 174 ] Cr 2 Te 3 , [ 175 ] Cr 3 Te 4 , [ 194 ] Cr 5 Te 8 . [ 195 ] These Cr x Te y bulk crystals possess the alternating stacks of Cr‐filled and Cr‐defective layers along the c ‐axis, and exhibit the ferromagnetic transition temperature (Curie temperature, Tc) arranging from 170 to 360 K. It is found that the content of Cr plays an important role in their structure and magnetic properties.…”

Section: Physical Propertiesmentioning

confidence: 99%

“…Xue et al. [ 173 ] investigated the electrical transport and magnetic properties of the NiAs‐type CrTe thin films. Unlike the rectangle hysteresis loops by the magnetic measurements, they performed anomalous Hall experiments on the CrTe thin film less than 12‐nm‐thick and found interesting extra bump/dip features which were the same as a topological Hall effect in chiral magnets.…”

Section: Physical Propertiesmentioning

confidence: 99%

Two‐Dimensional Metal Telluride Atomic Crystals: Preparation, Physical Properties, and Applications

Tao

et al. 2021

Adv Funct Materials

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Atom‐thick 2D metal telluride atomic crystals (2D MTACs) display many fascinating physical properties for potential applications in multiple fields. In this review, recent advances in the preparation, physical properties and applications of 2D MTACs are presented. First, three kinds of the most available preparation methods for 2D single crystal MTACs have been summarized, including single crystal‐based mechanical exfoliation, molecular beam epitaxy, and chemical vapor deposition. Second, the recent progress on abundant physical properties of 2D MTACs is briefly introduced, including surface electronic properties, optoelectronic properties, electronic transport, and thermoelectric properties, ferroelectric properties, superconducting properties, and ferromagnetic properties. Third, the potential electronics, spintronics, optoelectronics and energy applications of 2D MTACs are presented. Finally, some significant challenges and opportunities in 2D MTACs are briefly addressed.

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Observation of unconventional anomalous Hall effect in epitaxial CrTe thin films

Cited by 81 publications

References 34 publications

Room-temperature intrinsic ferromagnetism in epitaxial CrTe2 ultrathin films

Room-temperature intrinsic ferromagnetism in epitaxial CrTe2 ultrathin films

Topological Hall Effect in Traditional Ferromagnet Embedded with Black-Phosphorus-Like Bismuth Nanosheets

Two‐Dimensional Metal Telluride Atomic Crystals: Preparation, Physical Properties, and Applications

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