Modulating Curie Temperature and Magnetic Anisotropy in Nanoscale-Layered Cr2Te3Films: Implications for Room-Temperature Spintronics

In Hak Lee, Byoung Ki Choi, Hyuk Jin Kim, Min Jay Kim, Hu Young Jeong, Jong Hoon Lee, Seung Young Park, Younghun Jo, Chanki Lee, Jun Woo Choi, Seong Won Cho, Suyoun Lee, Younghak Kim, Beom Hyun Kim, Kyeong Jun Lee, Jin Eun Heo, Seo Hyoung Chang, Fengping Li, Bheema Lingam Chittari, Jeil JungYoung Jun Chang

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Nanoscale-layered ferromagnets have demonstrated fascinating two-dimensional magnetism down to atomic layers, providing a peculiar playground of spin orders for investigating fundamental physics and spintronic applications. However, the strategy for growing films with designed magnetic properties is not well established yet. Herein, we present a versatile method to control the Curie temperature (TC) and magnetic anisotropy during the growth of ultrathin Cr2Te3 films. We demonstrate an increase of the TC from 165 to 310 K in sync with magnetic anisotropy switching from an out-of-plane orientation to an in-plane one, respectively, via controlling the Te source flux during film growth, leading to different c-lattice parameters while preserving the stoichiometries and thicknesses of the films. We attributed this modulation of magnetic anisotropy to the switching of the orbital magnetic moment, using X-ray magnetic circular dichroism analysis. We also inferred that different c-lattice constants might be responsible for the magnetic anisotropy change, supported by theoretical calculations. These findings emphasize the potential of ultrathin Cr2Te3 films as candidates for developing room-temperature spintronics applications, and similar growth strategies could be applicable to fabricate other nanoscale layered magnetic compounds.

Original languageEnglish
Pages (from-to)4810-4819
Number of pages10
JournalACS Applied Nano Materials
Volume4
Issue number5
DOIs
StatePublished - 28 May 2021

Keywords

  • magnetic anisotropy
  • nanoscale-layered-ferromagnets
  • room-temperature ferromagnetism
  • spintronic applications
  • two-dimensional materials

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