Investigation of the monopole magneto-chemical potential in spin ices using capacitive torque magnetometry

Naween Anand, Kevin Barry, Jennifer N. Neu, David E. Graf, Qing Huang, Haidong Zhou, Theo Siegrist, Hitesh J. Changlani and Christianne Beekman ()
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Naween Anand: National High Magnetic Field Laboratory
Kevin Barry: National High Magnetic Field Laboratory
Jennifer N. Neu: National High Magnetic Field Laboratory
David E. Graf: National High Magnetic Field Laboratory
Qing Huang: University of Tennessee, Department of Physics
Haidong Zhou: University of Tennessee, Department of Physics
Theo Siegrist: National High Magnetic Field Laboratory
Hitesh J. Changlani: National High Magnetic Field Laboratory
Christianne Beekman: National High Magnetic Field Laboratory

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract The single-ion anisotropy and magnetic interactions in spin-ice systems give rise to unusual non-collinear spin textures, such as Pauling states and magnetic monopoles. The effective spin correlation strength (Jeff) determines the relative energies of the different spin-ice states. With this work, we display the capability of capacitive torque magnetometry in characterizing the magneto-chemical potential associated with monopole formation. We build a magnetic phase diagram of Ho2Ti2O7, and show that the magneto-chemical potential depends on the spin sublattice (α or β), i.e., the Pauling state, involved in the transition. Monte Carlo simulations using the dipolar-spin-ice Hamiltonian support our findings of a sublattice-dependent magneto-chemical potential, but the model underestimates the Jeff for the β-sublattice. Additional simulations, including next-nearest neighbor interactions (J2), show that long-range exchange terms in the Hamiltonian are needed to describe the measurements. This demonstrates that torque magnetometry provides a sensitive test for Jeff and the spin-spin interactions that contribute to it.

Date: 2022
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DOI: 10.1038/s41467-022-31297-1

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