Mechanical control of competing magnetic order in crystalline MnPtGa membranes
Abstract
MnPtGa hosts competing magnetic states, including ferromagnetic, canted antiferromagnetic, and spin density wave (SDW) order in the centrosymmetric P63/mmc structure, while a related inversion-broken structure supports chiral skyrmions. Controlling this competition motivates materials platforms that enable tunable strain and symmetry breaking, together with probes of SDW order compatible with ultrathin samples. Here, we demonstrate single crystalline MnPtGa membranes grown by molecular beam epitaxy on graphene/Ge(111) and released by mechanical exfoliation. X-ray and electron diffraction confirm high crystalline quality. SQUID magnetometry reveals a 140 K anomaly in the zero-field-cooled dM/dT that persists after exfoliation, while time-resolved reflectivity shows a coincident peak in the electronic relaxation time consistent with a quasiparticle phonon bottleneck associated with a putative SDW gap. Intentional rippling suppresses the ∼ 140 K magnetic anomaly, demonstrating mechanical control of the low-temperature state. These results establish MnPtGa membranes as a platform for detecting and strain-tuning competing magnetic orders.
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BibTeX
@misc{rawat2026mechanical,
title = {{Mechanical control of competing magnetic order in crystalline MnPtGa membranes}},
author = {R Rawat and F Fei and T Samanta and Z LaDuca and K Su and M Arnold and J Xiao and J K Kawasaki},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.12425},
eprint = {2609.12425},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.12425},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Mechanical control of competing magnetic order in crystalline MnPtGa membranes
AU - R Rawat
AU - F Fei
AU - T Samanta
AU - Z LaDuca
AU - K Su
AU - M Arnold
AU - J Xiao
AU - J K Kawasaki
PY - 2026
DA - 2026/09/11
PB - arXiv
DO - 10.48550/arxiv.2609.12425
UR - https://arxiv.org/abs/2609.12425
AB - MnPtGa hosts competing magnetic states, including ferromagnetic, canted antiferromagnetic, and spin density wave (SDW) order in the centrosymmetric P6_3/mmc structure, while a related inversion-broken structure supports chiral skyrmions. Controlling this competition motivates materials platforms that enable tunable strain and symmetry breaking, together with probes of SDW order compatible with ultrathin samples. Here, we demonstrate single crystalline MnPtGa membranes grown by molecular beam epitaxy on graphene/Ge(111) and released by mechanical exfoliation. X-ray and electron diffraction confirm high crystalline quality. SQUID magnetometry reveals a 140 K anomaly in the zero-field-cooled dM/dT that persists after exfoliation, while time-resolved reflectivity shows a coincident peak in the electronic relaxation time consistent with a quasiparticle phonon bottleneck associated with a putative SDW gap. Intentional rippling suppresses the ∼ 140 K magnetic anomaly, demonstrating mechanical control of the low-temperature state. These results establish MnPtGa membranes as a platform for detecting and strain-tuning competing magnetic orders.
ER -