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<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub> (LSMO) thin film sample on a single crystalline SrTiO<sub>3</sub> (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.
Highlights
Ferromagnetic resonance is a powerful technique which is used in the characterization and the study of magnetic systems
The recorded signal versus the field for the 15 uc LSMO thin film sample at 200 and 250 K is as shown in Fig. 1 and 2
The resonance spectrum is sinusoidal-like in nature and this is consistent with earlier research work which was conducted on LSMO bi-crystalline thin film sample at 150 K and 9.5 GHz on STO substrate (Alejandro et al, 2010)
Summary
Ferromagnetic resonance is a powerful technique which is used in the characterization and the study of magnetic systems. Typical examples of these magnetic systems include magnetic films and multilayer (Bah et al, 2006). Kittel proposed the theory of ferromagnetic resonance effect (Kittel, 1948). There are several advantages that make the technique of Ferromagnetic Resonance (FMR) unique especially when the technique is applied in the study of ultrathin films. Some of these advantages include; easy set-up of equipment (Farle, 1998)
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