The two-dimensional(2D)ferromagnetic materials and the related van der Waals homostructures have attracted considerable interest,while the 2D antiferromagnetic material has not yet been reported.Based on first-princip...The two-dimensional(2D)ferromagnetic materials and the related van der Waals homostructures have attracted considerable interest,while the 2D antiferromagnetic material has not yet been reported.Based on first-principles calculations,we investigate both electronic structures and magnetic orderings of bulk and monolayer of chromium diiodides(CrI2).We demonstrate a counter-intuitive fact that the ground state of the free-standing monolayer of CrI2 is antiferromagnetic though the bulk possesses macroscopic ferromagnetic ordering.The interlayer interaction remains antiferromagnetic up to few-layer scenarios.The unique feature of CrI2 makes it an ideal workbench to investigate the relation between magnetic couplings and interlayer van der Waals interactions,and may offer an opportunity to 2D antiferromagnetic spintronic devices.展开更多
We present a theory of both the itinerant carrier-mediated RKKY interaction and the virtual excitations-mediated Bloembergen–Rowland(BR)interaction between magnetic moments in graphene induced by proximity effect wit...We present a theory of both the itinerant carrier-mediated RKKY interaction and the virtual excitations-mediated Bloembergen–Rowland(BR)interaction between magnetic moments in graphene induced by proximity effect with a ferromagnetic film.It is shown that the RKKY/BR interaction consists of the Heisenberg,Ising,and Dzyaloshinskii–Moriya(DM)terms.In the case of the nearest distance,we estimate the DM term from the RKKY/BR interaction is about$0.13$meV for the graphene/Co interface,which is consistent with the experimental result of DM interaction$0.16\pm0.05$meV.Our calculations indicate that the intralayer RKKY/BR interaction may be a possible physical origin of the DM interaction in the graphene-ferromagnet interface.This work provides a new perspective to comprehend the DM interaction in graphene/ferromagnet systems.展开更多
基金This work was supported by the National Natural Science Foundation of China(No.11404043)Graduate Research Innovation Project of Chongqing(No.CYS18253).
文摘The two-dimensional(2D)ferromagnetic materials and the related van der Waals homostructures have attracted considerable interest,while the 2D antiferromagnetic material has not yet been reported.Based on first-principles calculations,we investigate both electronic structures and magnetic orderings of bulk and monolayer of chromium diiodides(CrI2).We demonstrate a counter-intuitive fact that the ground state of the free-standing monolayer of CrI2 is antiferromagnetic though the bulk possesses macroscopic ferromagnetic ordering.The interlayer interaction remains antiferromagnetic up to few-layer scenarios.The unique feature of CrI2 makes it an ideal workbench to investigate the relation between magnetic couplings and interlayer van der Waals interactions,and may offer an opportunity to 2D antiferromagnetic spintronic devices.
基金Supported by the National Natural Science Foundation of China(Grant Nos.11404043 and 1160041160)the Key Technology Innovations Project to Industries of Chongqing(Grant No.cstc2016zdcy-ztzx0067)the Graduate Research Innovation Project of Chongqing(Grants No.CYS18253).
文摘We present a theory of both the itinerant carrier-mediated RKKY interaction and the virtual excitations-mediated Bloembergen–Rowland(BR)interaction between magnetic moments in graphene induced by proximity effect with a ferromagnetic film.It is shown that the RKKY/BR interaction consists of the Heisenberg,Ising,and Dzyaloshinskii–Moriya(DM)terms.In the case of the nearest distance,we estimate the DM term from the RKKY/BR interaction is about$0.13$meV for the graphene/Co interface,which is consistent with the experimental result of DM interaction$0.16\pm0.05$meV.Our calculations indicate that the intralayer RKKY/BR interaction may be a possible physical origin of the DM interaction in the graphene-ferromagnet interface.This work provides a new perspective to comprehend the DM interaction in graphene/ferromagnet systems.
