Field-Tunable Interactions and Frustration in Underlayer-Mediated Artificial Spin Ice

Susan Kempinger, Yu Sheng Huang, Paul Lammert, Michael Vogel, Axel Hoffmann, Vincent H. Crespi, Peter Schiffer, Nitin Samarth

Research output: Contribution to journalArticlepeer-review

Abstract

Artificial spin ice systems have opened experimental windows into a range of model magnetic systems through the control of interactions among nanomagnet moments. This control has previously been enabled by altering the nanomagnet size and the geometry of their placement. Here we demonstrate that the interactions in artificial spin ice can be further controlled by including a soft ferromagnetic underlayer below the moments. Such a substrate also breaks the symmetry in the array when magnetized, introducing a directional component to the correlations. Using spatially resolved magneto-optical Kerr effect microscopy to image the demagnetized ground states, we show that the correlation of the demagnetized states depends on the direction of the underlayer magnetization. Further, the relative interaction strength of nearest and next-nearest neighbors varies significantly with the array geometry. We exploit this feature to induce frustration in an inherently unfrustrated square lattice geometry, demonstrating new possibilities for effective geometries in two-dimensional nanomagnetic systems.

Original languageEnglish (US)
Article number117203
JournalPhysical review letters
Volume127
Issue number11
DOIs
StatePublished - Sep 10 2021

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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