Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 39: Micro- and nanostructured magnetic materials
MA 39.5: Vortrag
Donnerstag, 15. März 2018, 10:30–10:45, H 0112
Nanoscale control of geometrical frustration in a dipolar trident lattice — Alan Farhan1, •Charlotte Petersen2,3, Scott Dhuey1, Luca Anghinolfi4, Qi Hang Qin2, Michael Saccone5, Sven Velten1,6, Clemens Wuth1,7, Sebastian Gliga8, Paula Mellado9, Mikko Alava2, Andreas Scholl1, and Sebastiaan van Dijken2 — 1Lawrence Berkeley National Laboratory, Berkeley, CA, USA. — 2Aalto University, Finland. — 3Universität Innsbruck, Austria — 4Università di Genova, Italy. — 5University of California, Santa Cruz, CA, USA. — 6Universität Hamburg, Germany. — 7Daegu Gyeongbuk Institute of Science and Technology, Hyeonpungmyeon, Dalseong-gun, Daegu, Republic of Korea. — 8University of Glasgow, UK. — 9Adolfo Ibáñez University, Diagonal Las Torres, Peñalolén, Santiago, Chile.
Artificial spin ice consists of interacting magnetic subunits arranged on a two dimensional lattice. A key feature is the ability to precisely control the geometry, and so manufacture highly frustrated systems that are hindered to minimize their local interactions by lattice constraints. We present a new lattice geometry where the balance of competing interactions between nearest-neighbour moments can be directly controlled [1]. This allows for tuning of the geometrical frustration. By varying the lattice parameters, we observe that the system either accesses a long-range ordered ground state, or under the same conditions, remains in a disordered state with short-range correlations.
[1] A. Farhan et. al., Nature Communications 8, 995 (2017).