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Interface magnetic coupling and magnetization dynamic of La$_{2/3}$Sr$_{1/3}$MnO$_3$ single layer and (La$_{2/3}$Sr$_{1/3}$MnO$_3$/SrRuO$_3$)$_n$ (n = 1, 5) superlattice on SrTiO$_3$(001) substrate

Ilyas Noor Bhatti, Rachna Chaurasia, Kazi Rumanna Rahman, Sukhendu Sadhukhan, Amantulla Mansuri, Imtiaz Noor Bhatti

Abstract

In this work, we investigate the structural, magnetic, and microwave magnetic dynamics of multilayered \([{\rm LSMO}/{\rm SRO}]_n\) heterostructures \((n = 1 \text{ and } 5)\) grown on SrTiO\(_3\) (001) substrates. X-ray diffraction confirms high crystallinity and atomically sharp interfaces. Magnetic measurements reveal strong interfacial magnetic coupling, with a distinct two-step magnetization switching observed in the \(n = 5\) heterostructure, while this feature is significantly suppressed in the \(n = 1\) structure. Ferromagnetic resonance (FMR) analysis shows a broad linewidth, pronounced positive magnetic anisotropy, and Gilbert damping on the order of \(10^{-2}\), with damping decreasing as the number of multilayer repetitions increases. These observations demonstrate that Ru--Mn exchange coupling at the interface critically governs the magnetic response and dynamic behavior of the system. The tunable switching and damping properties highlight such oxide heterointerfaces as promising platforms for exploring spin textures, magnetic domain behavior, and room-temperature spintronic applications.

Interface magnetic coupling and magnetization dynamic of La$_{2/3}$Sr$_{1/3}$MnO$_3$ single layer and (La$_{2/3}$Sr$_{1/3}$MnO$_3$/SrRuO$_3$)$_n$ (n = 1, 5) superlattice on SrTiO$_3$(001) substrate

Abstract

In this work, we investigate the structural, magnetic, and microwave magnetic dynamics of multilayered heterostructures \((n = 1 \text{ and } 5)\) grown on SrTiO (001) substrates. X-ray diffraction confirms high crystallinity and atomically sharp interfaces. Magnetic measurements reveal strong interfacial magnetic coupling, with a distinct two-step magnetization switching observed in the heterostructure, while this feature is significantly suppressed in the structure. Ferromagnetic resonance (FMR) analysis shows a broad linewidth, pronounced positive magnetic anisotropy, and Gilbert damping on the order of , with damping decreasing as the number of multilayer repetitions increases. These observations demonstrate that Ru--Mn exchange coupling at the interface critically governs the magnetic response and dynamic behavior of the system. The tunable switching and damping properties highlight such oxide heterointerfaces as promising platforms for exploring spin textures, magnetic domain behavior, and room-temperature spintronic applications.
Paper Structure (10 sections, 2 equations, 6 figures)

This paper contains 10 sections, 2 equations, 6 figures.

Table of Contents

  1. Introduction
  2. Experimental Details
  3. Results and Discussion
  4. Structural and Surface Characterization
  5. X-ray photo-electron spectroscopy (XPS)
  6. Magnetic study
  7. Microwave magnetic dynamics
  8. Summary and Conclusion
  9. Acknowledgment
  10. Conflict of interest

Figures (6)

  • Figure 1: (color online) X-ray characterization (a-b) shows the (001) and (002) peaks of 2$\theta$/$\omega$ scans respectively, here for superlattice sample multipal peaks associated with interfaces are also seen where numbering represent layers (c) X-ray reflectivity along with simulated curves (solid red lines) are presented. (d) Reciprocal space mapping near (103) reflection
  • Figure 2: (color online) Atomic force microscope surface micrograph (a) shows AFM image for LSMO/STO and (b) shows image for [LSMO/SRO]$_1$/STO bi-layer sample. (c and d) present the line profile along a arbitrary line for each image.
  • Figure 3: (Color online) X-ray Photoemission spectroscopy (a) shows the core level spectra of La 4$d$ (b) shows the core level spectra of Sr 3$d$ (c) shows the core level spectra of Mn 2$p$ (d) shows the core level spectra of O 1$s$. In the figure the red solid line is the overall envelop of the XPS spectrum and the other colored solid lines are the respective fitted peaks as marked in figures.
  • Figure 4: (color online) Isothermal magnetization measured at 300 K, 150 K and 50 K presented for (a) LSMO/STO, inset shows Isothermal magnetization of SRO at 100 K, (b) [LSMO/SRO]$_1$, and (c) [LSMO/SRO]$_5$. Inset of each figure present the layer schematic of grown samples.
  • Figure 5: (color online) FMR analysis for single layer LSMO/STO(001) sample (1) FMR signal for 4.0 GHz at 21.0 dBm, solid red line is fitting due to sum of symmetric and anti-symmetric Lorentz function (2) resonance field plotted against resonance frequency, solid line is fitting due to Kittel's formula (see text) (3) shows linewidth ($\Delta$H$_pp$) as a function of resonance frequency, solid line is linear fitting (see text). The obtained values are inserted in the corresponding figures.
  • ...and 1 more figures