What question did this study set out to answer?

To study the magnetic anisotropy and spin-wave excitations in the ferromagnet FeGeTe.

March 28, 2026

Study of Magnetoresistance Plateau as a Probe of Spin‐Wave Excitations in Fe4₄GeTe2₂

Key Points

To study the magnetic anisotropy and spin-wave excitations in the ferromagnet FeGeTe.
Analyzed magnetic and magneto-transport properties of Fe4GeTe2
Investigated spin-wave excitations through systematic measurements
Identified spin-wave excitation gap leading to observable magnetoresistance plateaus.
Discovered a spin-wave excitation gap in Fe4GeTe2
Observed distinct magnetoresistance plateaus linked to spin-wave dynamics
Clarified the role of magnetic anisotropy in spin behavior.

Abstract

Magnetic anisotropy is a key factor in stabilizing magnetic long‐range order in 2D van der Waals (vdW) ferromagnets, circumventing the limitations of low‐dimensional magnetism as described by the Mermin–Wagner theorem. FeGeTe (F4GT) is a nearly room‐temperature ferromagnet, well known for hosting competing anisotropic interactions that lead to a spin‐reorientation transition. In this report, we analyze the nature of magnetic anisotropy and spin‐wave excitation in F4GT through a comprehensive study of its magnetic and magneto‐transport properties. Our findings reveal the novel observation of a spin‐wave excitation gap, giving rise to magnetoresistance plateaus in F4GT.

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Study of Magnetoresistance Plateau as a Probe of Spin‐Wave Excitations in Fe4₄GeTe2₂

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