Temperature and Angular Dependence of Ferromagnetic Resonance (FMR) Signal of La_0.7Sr_0.3MnO₃ (LSMO) Thin Film Using FMR Technique

Abstract

This research study was aimed at determining the temperature dependence of Ferromagnetic Resonance (FMR), the recorded signal versus angle and the magnetic property of the 15 uc thick La 0.7 Sr 0.3 MnO 3 (LSMO) thin film sample on a single crystalline SrTiO 3 (STO) substrate at 150 K and 9.75 GHz using ferromagnetic resonance technique. We observed from the Ferromagnetic Resonance (FMR) spectra at various temperatures (150, 200 and 250 K, respectively) that as the temperature increases, the FMR spectra shifts to higher fields and this might be as a result of transition into the ferromagnetic state. The recorded signal versus the angle showed an unusual phenomenon at all temperatures (150, 200 and 250 K, respectively) and this might be due to shape effects and other contributing factors such as misfit strain and crystal misfit in the LSMO thin film. The plot of resonance field versus the in-plane angle showed a spectrum which was sinusoidal-like in nature with maximum and minimum curvatures. The resonance position and the Full Width Half Maximum (FWHM) of the 15 uc thick LSMO thin film were 718.15 and 561.45 Oe, respectively. The 15 uc thick LSMO thin film displayed ferromagnetic resonance at 150, 200 and 250 K, respectively and this has been confirmed using the surface plot.

Surface anisotropy induced spin wave nonreciprocity in epitaxial La0.33 Sr0.67 MnO3 film on SrTiO3 substrate

“…1,2 Recently, perovskite LSMO is attracting more and more interest in the field of spintronics due to recent observations of the electric field tunability of the magnetoresistance, spin Seebeck effect, and critical temperature of magnetic phase transitions. [3][4][5][6][7][8][9][10] Moreover, epitaxial LSMO on a SrTiO 3 (STO) substrate is also attractive for the study of spin wave transmission [11][12][13][14] due to its low Gilbert damping 15 of a $ 10 À4 and low lattice mismatch with the substrate, which make it a promising candidate for a spin wave transmission study. 16 Spin waves possess interesting characteristics such as high-speed information processing due to their high frequency up to THz and their fairly low energy consumption due to the absence of charge current.…”