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arXiv 2103.08964cond-mat.mtrl-sci
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二维反铁磁Ge2F的复磁性:从Néel自旋织构到潜在反铁磁Skyrmion

Complex magnetism of the two-dimensional antiferromagnetic Ge2F: from a Néel spin-texture to a potential antiferromagnetic skyrmion

Fatima Zahra Ramadan, Flaviano José dos Santos, Lalla Btissam Drissi, Samir Lounis

摘要:

基于密度泛函理论结合低能模型,研究了由半氟化锗烯(Ge 2F)掺杂氟原子构成的原子厚度二维混合材料的磁性.氟原子是高度电负性的,其诱导磁性并破坏反转对称性,从而触发有限且强的Dzyaloshinskiii-Moriya相互作用(Dzyaloshinskii-Moriya interaction)。第一、第二和第三近邻之间的磁交换相互作用具有反铁磁性质,导致磁阻挫。Néel态被认为是最稳定的状态,磁矩位于表面平面。这是由于磁矢量的面外分量引起的,这似乎引起了有效的面内磁各向异性。在施加磁场时,自旋螺旋和反铁磁skyrmions可以稳定。我们推测,这可以通过由磁性基板诱导的磁交换场来实现。为了完成我们的表征,我们计算了自旋波激发和由此产生的光谱,这可以通过电子能量损失光谱,磁拉曼光谱或扫描隧道光谱探测。

英文摘要:

Based on density functional theory combined with low-energy models, we explore the magnetic properties of a hybrid atomic-thick two-dimensional (2D) material made of Germanene doped with fluorine atoms in a half-fluorinated configuration (Ge2F). The Fluorine atoms are highly electronegative, which induce magnetism and break inversion symmetry, triggering thereby a finite and strong Dzyaloshinskii-Moriya interaction (DMI). The magnetic exchange interactions is of antiferromagnetic nature among the first, second and third neighbors, which leads to magnetic frustration. The Néel state is found to be the most stable state, with magnetic moments lying in the surface plane. This results from the out-of-plane component of the DMI vector, which seems to induce an effective in-plane magnetic anisotropy. Upon application of a magnetic field, spin-spirals and antiferromagnetic skyrmions can be stabilized. We conjecture that this can be realized via magnetic exchange fields induced by a magnetic substrate. To complete our characterization, we computed the spin-wave excitations and the resulting spectra, which could be probed via electron energy loss spectroscopy, magneto-Raman spectroscopy or scanning tunneling spectroscopy.

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