Near Degeneracy of Magnetic Phases in Two-Dimensional Chromium Telluride with Enhanced Perpendicular Magnetic Anisotropy

Abstract

The discovery of atomically thin van der Waals magnets (e.g., CrI3 and Cr2Ge2Te6) has triggered a renaissance in the study of two-dimensional (2D) magnetism. Most of the 2D magnetic compounds discovered so far host only one single magnetic phase unless the system is at a phase boundary. In this work, we report the near degeneracy of magnetic phases in ultrathin chromium telluride (Cr2Te3) layers with strong perpendicular magnetic anisotropy highly desired for stabilizing 2D magnetic order. Single-crystalline Cr2Te3 nanoplates with a trigonal structure (space group P3̅1c) were grown by chemical vapor deposition. The bulk magnetization measurements suggest a ferromagnetic (FM) order with an enhanced perpendicular magnetic anisotropy, as evidenced by a coercive field as large as ∼14 kOe when the field is applied perpendicular to the basal plane of the thin nanoplates. Magneto-optical Kerr effect studies confirm the intrinsic ferromagnetism and characterize the magnetic ordering temperature of individual nanoplates. First-principles density functional theory calculations suggest the near degeneracy of magnetic orderings with a continuously varying canting from the c-axis FM due to their comparable energy scales, explaining the zero-field kink observed in the magnetic hysteresis loops. Our work highlights Cr2Te3 as a promising 2D Ising system to study magnetic phase coexistence and switches for ultracompact information storage and processing.

Engineered neutrophil-derived exosome-like vesicles for targeted cancer therapy

“…Considering that the retention of the administrated N-Ex in the liver and spleen may hinder their therapeutic efficacy, we then decorated N-Ex with SPIONs by transferrin (Tf)–transferrin receptor (TfR) interaction to improve their tumor-targeting capability ( 21 , 22 ). The magnetic behavior of Tf-SPION is shown in fig.…”

Interfacial engineering manipulation of magnetic anisotropy evolution via orbital reconstruction in low-dimensional manganite superlattices

“…The evolution of the magnetic easy-axis direction is further characterized by the temperature dependence of the magnetic moment (M-T) [44]. Fig.…”

Composition‐Dependent Magnetic Ordering in Freestanding 2D Non‐van der Waals Cr2TexSe3−x Crystals

“…Using mechanical exfoliation techniques, a series of 2D intrinsic magnetic materials have been synthesized, including CrX 3 (X = Cl, Br, I), CrGe(Si)Te 3 , CrSBr, CrPS 4 , and MPS 3 (M = Mn, Fe, Ni). [1][2][4][5][6][7][8][9][10] Based on first-principles calculations, hundreds of 2D vdW magnets have been predicted for breakthroughs to realize controlled synthesis of 1 and 2 unit-cell CrSe and Cr 2 Te 3 by CVD growth and found these 2D ultrathin films show obvious thickness-dependent Curie temperature, the highest value is 280 K. Xu et al [36] reported that hexagonal CrTe 2 monolayer grown on bilayer graphene substrates by MBE with T C = 200 K. Zhang et al [37] reported that trigonal ultrathin Cr 2 Te 3 films are FM with T C = 195 K and exhibit strong perpendicular magnetic anisotropy with 5 × 10 6 J m −3 , and Li et al [38] prepared 2D nanosheets of α-MnSe 2 with nonstoichiometric surfaces via soft chemical etching, which were found to be a FM semiconductor with T C = 320 K. In addition, the robust FM/AFM order have also been found in 2D non-vdW CrSe 2 , Fe 7 Se 8 , Cr 5 Te 8 , FeTe, CrTe, α-MnSe 2 , and FeSe ultrathin films, their T C is up to 110, 300, 160, 220, 367, 160, and 553 K, respectively. [27,28,31,[38][39][40][41] Compared to 2D vdW magnets, 2D non-vdW ultrathin films have strong interlayer chemical bonding.…”