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

Author

Listed:
  • Naween Anand

    (National High Magnetic Field Laboratory
    Intel Corp.)

  • Kevin Barry

    (National High Magnetic Field Laboratory
    Florida State University, Department of Physics
    Ateios Systems)

  • Jennifer N. Neu

    (National High Magnetic Field Laboratory
    Florida State University, Department of Physics
    Oak Ridge National Laboratory, Nuclear Nonproliferation Division)

  • 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
    Florida Agricultural and Mechanical University and Florida State University, College of Engineering)

  • Hitesh J. Changlani

    (National High Magnetic Field Laboratory
    Florida State University, Department of Physics)

  • Christianne Beekman

    (National High Magnetic Field Laboratory
    Florida State University, Department of Physics)

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.

Suggested Citation

  • Naween Anand & Kevin Barry & Jennifer N. Neu & David E. Graf & Qing Huang & Haidong Zhou & Theo Siegrist & Hitesh J. Changlani & Christianne Beekman, 2022. "Investigation of the monopole magneto-chemical potential in spin ices using capacitive torque magnetometry," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31297-1
    DOI: 10.1038/s41467-022-31297-1
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    References listed on IDEAS

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    1. Anjana M. Samarakoon & Kipton Barros & Ying Wai Li & Markus Eisenbach & Qiang Zhang & Feng Ye & V. Sharma & Z. L. Dun & Haidong Zhou & Santiago A. Grigera & Cristian D. Batista & D. Alan Tennant, 2020. "Machine-learning-assisted insight into spin ice Dy2Ti2O7," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
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