Journal Article

PUBDB-2022-06646

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetic monopole density and antiferromagnetic domain control in spin-ice iridates

Pearce, M. J. ; Götze, K. C.Extern*DESY* ; Szabó, A. ; Sikkenk, T. S. ; Lees, M. R. ; Boothroyd, A. T.Extern* ; Prabhakaran, D.Extern* ; Castelnovo, C. (Corresponding author) ; Goddard, P. A. (Corresponding author)

2022
Nature Publishing Group UK [London]

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Please use a persistent id in citations: doi:10.1038/s41467-022-27964-y  doi:10.3204/PUBDB-2022-06646

Abstract: Magnetically frustrated systems provide fertile ground for complex behaviour, including unconventional ground states with emergent symmetries, topological properties, and exotic excitations. A canonical example is the emergence of magnetic-charge-carrying quasiparticles in spin-ice compounds. Despite extensive work, a reliable experimental indicator of the density of these magnetic monopoles is yet to be found. Using measurements on single crystals of Ho$_2$Ir$_2$O$_7$ combined with dipolar Monte Carlo simulations, we show that the isothermal magnetoresistance is highly sensitive to the monopole density. Moreover, we uncover an unexpected and strong coupling between the monopoles on the holmium sublattice and the antiferromagnetically ordered iridium ions. These results pave the way towards a quantitative experimental measure of monopole density and demonstrate the ability to control antiferromagnetic domain walls using a uniform external magnetic field, a key goal in the design of next-generation spintronic devices.

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Contributing Institute(s):

1. FS-Undulator Systeme (FS-US)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2022

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