Colossal magnetoresistance ferrimagnet Mn₃Si₂Te₆

Mn₃Si₂Te₆

Also called MST

van der Waals crystal magnet

A layered ferrimagnet whose resistance collapses when the magnetic field is turned to a particular direction – colossal angular magnetoresistance, rather than the usual colossal magnetoresistance that depends only on field strength. The explanation on offer is exotic: loops of orbital current circulating on the tellurium edges of the manganese octahedra, which the field can switch on and off, making this crystal one of the few places where orbital currents are argued to control transport.

Data sheet

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Kind of sheet: van der Waals crystal
Peels off a layered crystal, one sheet at a time
Behaves as: magnet
Band gap: A narrow-gap semiconductor whose resistance drops by orders of magnitude in a magnetic field
Thickness: ~0.7 nm per layer
Structure: Manganese in tellurium octahedra with Si₂Te₆ units filling the gaps, forming layers stacked by van der Waals forces; two inequivalent manganese sites make the magnetism ferrimagnetic
Space group: Mn₃Si₂Te₆: bulk P31c
Bulk: the Materials Project crystal linked below
Stability: Air-stable enough for handling, though tellurium surfaces degrade over time; flakes are usually capped for transport.
First made: Colossal angular magnetoresistance reported in 2021 (Seo and colleagues); chiral orbital currents proposed as the explanation in 2022 (Zhang and colleagues); the picture tested by substitution in 2025 (Das and colleagues)
Materials Project: Mn₃Si₂Te₆
Computed crystal structure and properties

Compare with other materials

Key properties

Colossal angular magnetoresistance: the resistance depends on the direction of the applied field, not only its size
Ferrimagnetic order from two inequivalent manganese sites, with nodal-line features in the band structure
Chiral orbital currents proposed to run along the tellurium–tellurium edges of the MnTe₆ octahedra, driven by spin–orbit coupling on tellurium
Substituting selenium for tellurium weakens those currents and the angular magnetoresistance with them
Both peak-type and upturn-type colossal magnetoresistance appear in the same material

How it is made

Single crystals by flux growth or vapour transport from the elements
Chemical substitution on the tellurium site to test the orbital-current picture
Mechanical exfoliation into flakes for transport

Uses, and how close they are

Research platform for orbital-current physics and angle-dependent magnetoresistancelab

Readiness runs lab → prototype → pilot → deployed.

Open problems

Are chiral orbital currents real, and can they be imaged rather than inferred from transport?
Why does the resistance depend so strongly on field direction rather than magnitude?
Does the effect survive in thin flakes, where surfaces and strain matter more?

Going deeper

Short notes for specialists. Choose a lens in the header and yours comes first.

For theoreticians · your lens

The claim under test is that loop currents of orbital character, stabilised by spin–orbit coupling on tellurium, gate the conduction between layers – a mechanism outside the usual double-exchange picture of colossal magnetoresistance. Models must reproduce both the angular dependence and the coexistence of peak-type and upturn-type magnetoresistance, and the substitution experiments give a direct handle: replacing tellurium with selenium weakens the coupling and the effect.

For experimentalists · your lens

Angle is the variable: rotate the field and report the full angular dependence, not just a field sweep along one axis. Because both magnetisation direction and magnitude matter, magnetometry and transport should be measured on the same crystal, and substituted samples need their composition stated precisely.

For engineers · your lens

No device role today. The interest is that an angle-sensitive resistance switch, if understood, is an unusual functionality.

In the research tracks

Theory frontiers

Magnetic order in two dimensions

Recent news

The newest items tagged Mn₃Si₂Te₆, from the news feed updated 5 Oct 2026.

Preprintnot yet peer reviewed 4 Aug 2026 arXiv

Strain Tuning of Orbital-Driven Giant Magnetoresistance in van der Waals ferrimagnet Mn₃Si₂Te₆

Strain engineering of magnetotransport offers a powerful strategy for uncovering emergent electronic and domain phenomena in quantum magnetic materials, while providing a promising pathway toward next-generation mechanically programmable spintronic technologies. Van der Waals magnets are particularly attractive in this…

ExperimentMn₃Si₂Te₆

Preprintnot yet peer reviewed 20 Mar 2026 arXiv

Coherent canted ferrimagnetism and higher-order anisotropy in the nodal-line magnetic semiconductor Mn3Si2Te6

The interplay between magnetic order and electronic topology in van der Waals materials enables extreme responses to external stimuli. The nodal-line semiconductor Mn3Si2Te6 exemplifies this, exhibiting colossal angular magnetoresistance (CAMR) where resistivity changes by orders of magnitude upon rotating the magnetic…

TheoryMn₃Si₂Te₆

Preprintnot yet peer reviewed 3 Sep 2025 arXiv

Magnetic resonance and microwave resistance modulation in van der Waals colossal-magnetoresistance material

Colossal magnetoresistance (CMR) is a fascinating quantum phenomenon that continues to draw significant interest in condensed matter physics. Mn3Si2Te6 has emerged as a prototypical CMR material, notable for its puzzling magnetoresistance behavior and pronounced directional anisotropy. Despite extensive research, the…