Deconstructing Magnetization Noise: Degeneracies, Phases, and Mobile Fractionalized Excitations in Tetris Artificial Spin Ice
arXiv:2311.07801 · doi:10.1073/pnas.2310777120
Abstract
Direct detection of spontaneous spin fluctuations, or "magnetization noise", is emerging as a powerful means of revealing and studying magnetic excitations in both natural and artificial frustrated magnets. Depending on the lattice and nature of the frustration, these excitations can often be described as fractionalized quasiparticles possessing an effective magnetic charge. Here, by combining ultrasensitive optical detection of thermodynamic magnetization noise with Monte Carlo simulations, we reveal emergent regimes of magnetic excitations in artificial "tetris ice". A marked increase of the intrinsic noise at certain applied magnetic fields heralds the spontaneous proliferation of fractionalized excitations, which can diffuse independently, without cost in energy, along specific quasi-1D spin chains in the tetris ice lattice.
arXiv commentpublished in PNAS (2023)
References in corpus (23)
- The design and verification of Mumax3
- Magnetic Monopoles in Spin Ice
- Dirac Strings and Magnetic Monopoles in Spin Ice Dy2Ti2O7
- Magnetic Charge Transport
- Spin Ice, Fractionalization and Topological Order
- Signature of magnetic monopole and Dirac string dynamics in spin ice
- Spectroscopy of spontaneous spin noise as a probe of spin dynamics and magnetic resonance
- Extensive degeneracy, Coulomb phase and magnetic monopoles in an artificial realization of the square ice model
- Reconfigurable Training and Reservoir Computing in an Artificial Spin-Vortex Ice via Spin-Wave Fingerprinting
- Spin noise of electrons and holes in self-assembled quantum dots
- Unhappy Vertices in Artificial Spin Ice: Degeneracy from Vertex-Frustration
- Magnetic monopole and string excitations in a two-dimensional spin ice
- Optical measurements of spin noise as a high resolution spectroscopic tool
- Magnetic Monopole Noise
- Dynamical fractal and anomalous noise in a clean magnetic crystal
- Spontaneous Magnetic Superdomain Wall Fluctuations in an Artificial Antiferromagnet
- Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice
- Anomalous magnetic noise in imperfect flat bands in the topological magnet Dy2Ti2O7
- Entropy-driven order in an array of nanomagnets
- Broadband spectroscopy of thermodynamic magnetization fluctuations through a ferromagnetic spin-reorientation transition
- The Colored Noise of Magnetic Monopoles: Subdiffusion in a Coevolving Vacuum and Spin Ice Exponents
- Magnetic-Field-Dependent Thermodynamic Properties of Square and Quadrupolar Artificial Spin Ice
- Deconstructing Magnetization Noise: Degeneracies, Phases, and Mobile Fractionalized Excitations in Tetris Artificial Spin Ice