When ferromagnetism goes 2D
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When ferromagnetism goes 2D
CIC nanoGUNE Seminars
- Speaker
-
Efren Navarro-Moratalla, Universidad de Valencia, Valencia, Spain
- When
-
2018/03/05
12:00
- Place
- nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
- Add to calendar
-
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The study of magnetism in one and
two dimensions is a longstanding problem in condensed matter physics. Already
half a century ago, Mermin and Wagner claimed that magnetic order in low
dimensions is forbidden in an isotropic spin lattice.[1] A plethora of
experiments have been performed thereafter to check the implications of this
celebrated theorem in layered bulk crystalline materials as an approximation
to a two-dimensional (2D) spin lattice. However, interlayer coupling in these
systems is never negligible and an approach for the study of true 2D magnetism
has been lacking to the date. With the avenue the 2D materials a genuine
approach to low-dimensionality was unlocked. The realization of long-range
magnetic order in a 2D material has been a tantalizing concept ever since the
discovery of graphene given the high stakes of the incorporation of magnetism
in van der Waals heterostructures for applications such as spintronics or
topological superconductivity. In this talk I will present our recent
discovery of the first true 2D ferromagnet made out of a single layer of a
ferromagnetic insulator: chromium triiodide (CrI3).[2] Our experiments also
showcase the dramatic layer dependence of the magnetic phase transitions and
ground states in atomically-thin van der Waals crystals down to the monolayer
and the intriguing metamagnetism emerging in bilayer CrI3. I will conclude by
outlining the potential of this new class of 2D magnets for optoelectronic
applications by the combination of magnetic hysteresis with helical
luminescence in the monolayer limit.[3]
[1] N. D. Mermin & H. Wagner, Phys. Rev. Lett. 17, 1133-1136 (1966)
[2] B. Huang et al. Nature 117, 610 (2017)
[3] K. L. Seyler et al. Nat. Phys. (2017)
About Efren Navarro-Moratalla
**Host** : L.E. Hueso
