Phase-controllable growth of ultrathin 2D magnetic FeTe crystals.
Lixing KangChen YeXiaoxu ZhaoXieyu ZhouJunxiong HuQiao LiDan LiuChandreyee Manas DasJiefu YangDianyi HuJieqiong ChenXun CaoYong ZhangManzhang XuJun DiDan TianPin SongGovindan KuttyQingsheng ZengQundong FuYa DengJiadong ZhouAriando AriandoFeng MiaoGuo HongYizhong HuangStephen J PennycookKen-Tye YongWei JiXiao Renshaw WangZheng LiuPublished in: Nature communications (2020)
Two-dimensional (2D) magnets with intrinsic ferromagnetic/antiferromagnetic (FM/AFM) ordering are highly desirable for future spintronic devices. However, the direct growth of their crystals is in its infancy. Here we report a chemical vapor deposition approach to controllably grow layered tetragonal and non-layered hexagonal FeTe nanoplates with their thicknesses down to 3.6 and 2.8 nm, respectively. Moreover, transport measurements reveal these obtained FeTe nanoflakes show a thickness-dependent magnetic transition. Antiferromagnetic tetragonal FeTe with the Néel temperature (TN) gradually decreases from 70 to 45 K as the thickness declines from 32 to 5 nm. And ferromagnetic hexagonal FeTe is accompanied by a drop of the Curie temperature (TC) from 220 K (30 nm) to 170 K (4 nm). Theoretical calculations indicate that the ferromagnetic order in hexagonal FeTe is originated from its concomitant lattice distortion and Stoner instability. This study highlights its potential applications in future spintronic devices.
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