Inductance Meets Memory in the Quantum Magnet Mn3Si2Te6

Abstract: Orbital degrees of freedom offer a largely untapped route to emergent dynamical phenomena in correlated quantum materials. However, it remains unclear whether collective orbital states can intrinsically generate both reactive and memory functionalities in a bulk system. Here we show that in the ferrimagnet Mn3Si2Te6, nonequilibrium reconfiguration of chiral orbital currents produces both emergent inductance and nonvolatile memristance as intrinsic properties of a single crystal. At low frequency and under a magnetic field along the c axis, coherent orbital-current domains generate robust clockwise inductive I-V loops. At higher frequency and low field, current-driven first-order reconfiguration leads to incomplete reversal and metastable trapping, producing an intrinsic electromotive force and a finite remanent voltage at zero current. These results establish orbital currents as a class of quantum state variables that encode both reactive and memory functionalities, opening routes toward intrinsically reconfigurable and energy-efficient electronic systems.

• The paper demonstrates that chiral orbital currents yield both intrinsic inductance and nonvolatile memristance, evidenced by a remanent voltage of 2.9 V at 24.4 Hz.
• Methodologically, frequency-, field-, and temperature-dependent transport measurements uncover discrete, first-order orbital reconfigurations and metastable memory effects.
• Implications include a novel pathway for integrating multifunctional orbitronic elements into ultra-low-power electronics and neuromorphic computing architectures.

Emergence of Inductive and Nonvolatile Memristive Behavior from Chiral Orbital Currents in Mn3Si2Te6

Introduction

This paper presents an incisive investigation into the transport phenomena arising from chiral orbital currents (COC) in the ferrimagnetic quantum magnet Mn₃Si₂Te₆ (2604.15635). The study delineates the unique capacity for single-crystal Mn₃Si₂Te₆ to simultaneously exhibit intrinsic inductance and nonvolatile memristance, directly stemming from collective orbital dynamics rather than geometric or ionic device physics. The authors systematically characterize the frequency, field, and temperature dependencies of the emergent behavior, providing a mechanistic framework and quantitative benchmarks relevant to orbitronics.

Orbital Texture-Driven Circuit Functionality

The dynamical reconfiguration of COC is identified as the central mechanism responsible for both the inductive and memory effects. Unlike spin or charge-based phenomena, orbital currents here establish extended loop patterns rigidly coupled to the lattice and magnetic background, resulting in unusually slow dynamics and enabling metastable states. The transport response of Mn₃Si₂Te₆ bifurcates into two regimes:

• Regime A: At low frequency ($f < 6$ Hz) and high magnetic field aligned along the $c$ axis ($H \parallel c$), the system stabilizes coherent COC domains, exhibiting robust clockwise inductive I–V loops—with voltage increase as current decreases—uncharacteristic of conventional resistive, capacitive, or conventional magnetic inductive responses.
• Regime B: At higher frequency ($f \gtrsim 24$ Hz) and zero or low $H\parallel c$, first-order reconfiguration of disordered or partially coherent orbital textures is driven by the AC current, producing incomplete reversals and metastable trapping across discrete energy barriers. This yields a persistent electromotive force (emf) and a finite remanent voltage ($V_m \neq 0$ at $I=0$), manifesting intrinsic memristance and establishing memory retention with timescales up to $\sim 10^2$ ms.

Quantitative Characterization and Distinctive Claims

The paper provides strong numerical evidence for the emergent inductance and memristive behavior:

• At $f = 24.4$ Hz and $T = 10$ K, the remanent voltage reaches $c$0 V for $c$1 mA. The deduced inductance $c$2 H for a millimeter-sized crystal far exceeds geometric estimates (typically nanohenries), implicating purely orbital collective effects unachievable in conventional materials (2604.15635).
• Clearly defined voltage thresholds ($c$3, $c$4, $c$5) mark abrupt changes in differential resistance with current sweep, evidencing discrete, first-order orbital reconfiguration events and multi-minima energy landscape traversal.
• Multi-sweep measurements reveal persistent state carry-over: a finite $c$6 persists across sweeps even when starting from $c$7, directly reflecting memory from prior cycles and incomplete orbital domain relaxation.
• The behavior persists above the ferrimagnetic ordering temperature ($c$8 K), with $c$9 peaking near $H \parallel c$0 and vanishing at $H \parallel c$1 K. This indicates that fluctuating and disordered orbital textures can encode memory even in the absence of static long-range order.

The authors demonstrate that nonvolatile memristive response is insensitive to $H \parallel c$2 (no COC formation), but selectively suppressed for increasing $H \parallel c$3. The field-frequency phase diagram thus sharply distinguishes regimes of orbital coherence, disorder, and their competition.

Microscopic Mechanism and Experimental Exclusion of Artefacts

First-order COC reconfiguration does not arise from Joule heating, ionic migration, or interfacial effects; instead, it is a collective nonequilibrium process intrinsic to the bulk material. The authors present comprehensive thermal diagnostics—frequency-dependent transport, anisotropic field response, pulsed/DC equivalence, and direct thermometry—to eliminate thermal artefacts. Their data support a purely orbital-driven origin for the observed circuit functionalities.

No capacitance or capacitive dissipation is observed over wide frequency and field ranges, further confirming the unique realization of three fundamental passive circuit elements (resistor, inductor, memristor) within a single bulk quantum material.

Theoretical and Practical Implications

This work substantiates the concept of orbitronics by establishing chiral orbital currents as bona fide state variables capable of encoding both reactive (inductive) and memory (memristive) functionalities. The findings contradict the prevailing paradigm that nonvolatile memory requires engineered nanostructures or ionic mechanisms, instead highlighting intrinsic quantum matter as a platform for dynamically reconfigurable circuit behavior.

On a practical level, the possibility of achieving millimeter-scale inductance and robust memory retention in a homogeneous crystal has implications for ultra-low-power, energy-efficient electronics. The metastable and frequency-tunable nature of the orbital memory suggests potential architectural advantages for neuromorphic computing and quantum-inspired logic.

Theoretically, the results motivate further exploration of collective order parameters in correlated materials as intrinsic circuit elements. The mapping of multi-minima free-energy landscapes to functional device properties expands the design space beyond conventional spin-orbital-charge degrees of freedom.

Future Directions

The demonstrated coexistence and tunability of inductive and memristive behavior invite several lines for further research:

• Extension to other orbitronic or strongly correlated materials to test universality and parameter dependence
• Integration of orbital dynamics with spintronic or ferroelectric elements, potentially enabling multifunctional devices
• Exploration of the dynamics at higher frequencies or under ultrafast and resonant excitation
• Theoretical modeling of the COC energy landscape and kinetics, as well as their coupling to external electromagnetic fields

Conclusion

The study establishes Mn₃Si₂Te₆ as a rare bulk quantum material hosting intrinsic inductance and nonvolatile memristance, directly attributable to slow, collective chiral orbital current dynamics and metastable domain reconfiguration. The empirical identification of robust, millimeter-scale inductance and memory retention—controlled by frequency and field—marks a significant advance for orbitronic physics and functional device engineering. The findings challenge conventional approaches to circuit element realization and open new avenues in correlated quantum material research, offering a platform for intrinsically reconfigurable, quantum-inspired electronics.