arXiv subjects

Saurav Sachin

Publications and source records attributed to Saurav Sachin.

3 recordsLinked to original sources

arXiv2026

Altermagnetic Superconducting Diode Effect in Mn$_{3}$Pt/Nb Heterostructures

Compensated magnetic orders that can split the spin-degeneracy of electronic bands have become a very active field of research. As opposed to spin-orbit coupling, the splitting resulting from these "altermagnets" is not a small relativistic correction and, in contrast to ferromagnets, not accompanied by a net magnetization and large stray fields. In particular, the theoretical analysis of the interplay of altermagnetism and superconductivity has taken center stage, while experimental investigations of their coexistence remain in their infancy. We here study heterostructures consisting of Nb thins films interfaced with the $T_1$ and $T_2$ phases of Mn$_3$Pt. These non-collinear magnetic states can be thought of as descendants from the same altermagnetic order in the absence of spin-orbit coupling. We demonstrate the non-trivial impact on the superconducting state of Nb, which exhibits a zero-field superconducting diode effect, despite the compensated ($T_2$) and nearly-compensated ($T_1$) magnetic order; the diode efficiencies can reach large values (up to 50$\%$). The diode effect is found to be highly sensitive to the form of the magnetic order, illustrating its potential as a symmetry probe. The complex magnetic field and temperature dependence hint at a rich interplay of multiple contributing mechanisms. Our results define a new materials paradigm for dissipationless spintronics and magnetization-free diode functionality, while motivating further exploration of non-collinear altermagnetic superconductors.

cond-mat.mes-hall↗

arXiv2025

Controlled spin-to-charge conversion in noncollinear antiferromagnet-based Py/Mn$_{3}$Pt heterostructure

Noncollinear antiferromagnets (NCAFs) have recently emerged as promising candidates for future spintronic technologies, offering ultrafast switching, negligible stray fields allowing dense packing, and robustness against external magnetic perturbations. When interfaced with ferromagnets (FMs), they can strongly influence interfacial exchange and spin-torque mechanisms that enable manipulating magnetic order and realizing functionalities beyond conventional heavy metals (HMs) based FM/HM heterostructures. Here, we perform a broadband ferromagnetic resonance (FMR) study to systematically investigate the magnetization dynamics and spin-to-charge conversion in permalloy (Py) and Mn$_3$Pt bilayers. High-quality Py films provide a well-defined FMR spectra with a low Gilbert damping parameter ( $α_{\mathrm{eff}} \approx 9.8 \times 10^{-3}$). We observe a pronounced enhancement of damping with intrinsic value $α_{\mathrm{int}} \approx 3.1 \times 10^{-2}$ in the Py/Mn$_3$Pt bilayer, indicating efficient spin pumping into the NCAF layer. Frequency dependent linewidth analysis shows a predominantly Gilbert type damping in the bilayers and the corresponding effective spin-mixing conductance ( $g^{\uparrow\downarrow}_{\mathrm{eff}} \approx 4.8 \times 10^{18}$m$^{-2}$) is comparable to that of other high-performance antiferromagnetic heterostructures. These results are significant for establishing NCAFs as a candidate material for spin generation and highlights the potential of Py/Mn$_3$Pt bilayers for efficient and ultrafast spintronic applications.

cond-mat.mtrl-sci↗

arXiv2025

Occurrence of chemically tuned spin-texture controlled large intrinsic anomalous Hall effect in epitaxial $Mn_{3+x}Pt_{1-x}$ thin Films

Achieving atomically flat and stoichiometric films of chiral antiferromagnets (AFM) with two-dimensional kagome spin lattice structures are crucial for integrating these materials in both established and emerging antiferromagnetic spintronic devices. We report a systematic study of growth and anomalous Hall effect in (111)-oriented non-collinear AFM $Mn_{3+x}Pt_{1-x}$ films with varying compositions, for x = 0.09, 0.17, 0.28. Under optimized growth conditions, we obtain stoichiometric and atomically flat epitaxial $Mn_{3}Pt$(111) films on Si(100) substrate, as evidenced by X-ray reflectivity and scanning probe microscopy. The magnetization measurement showed that epitaxial strain can induce a magnetic phase transition from an incommensurate spin state ($T_2$) at x = 0.09 to a triangular all-in/all-out AFM spin order ($T_1$) at x = 0.17, 0.28. The change in magnetic ground state is evident in the transport characteristics, as the ($T_1$) state shows a robust intrinsic anomalous Hall effect (AHE) persisting till room temperature, in contrast to the ($T_2$) state where AHE is negligible. Our studies reveal a hole-dominated conductance with room temperature anomalous Hall conductivity (AHC) ranging from 5 to 16 $Ω^{-1}cm^{-1}$ for x = 0.17 and 0.28 respectively. A scaling law is established, indicating that Hall resistivity is primarily governed by the intrinsic non-vanishing Berry curvature. The experimental observation corroborates the electronic structure calculations, which predicts the massless Dirac states near Fermi level in the bulk band structure, attributed to the presence of nonsymorphic glide symmetry. Additionally, we showed that chemical tuning via Mn doping can stabilize the required T$_1$ non-collinear AFM structure which enhance the topology driven intrinsic AHE.

cond-mat.mtrl-sci↗