Study of magnetization processes using higher harmonic ac‐susceptibility

Abstract

The ac‐susceptibility of a La0.7Sr0.3MnO3 epitaxial film was measured up to the 11th harmonic as a function of ac‐field amplitude, superimposed dc‐field and temperature. The experimental data reflect the magnetization hysteresis‐loop shape in a very precise and detailed way. This is further elucidated by numerical simulations of the ac‐susceptibility within a Preisach model with Gaussian distribution function. Using parameters from magnetization measurements the simulated ac‐susceptibility curves were found to be in good agreement with the experimental results. This shows that measurements of higher harmonic susceptibilities are a powerful tool for the precise study of magnetization processes. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Structural, magnetic, and electric properties of La0.7Sr0.3MnO3/PbZrxTi1−xO3 heterostructures

“…Figure 6 shows the ac susceptibility of sample VM17 at various temperatures. At a coercive field the loss component 1 Љ shows a clear transition 35 that was used for the determination of the coercive field values. The results are summarized in Fig.…”

Exchange bias and training effects in antiferromagnetically coupled La 0.7 Sr 0.3 MnO 3 /SrRuO 3 superlattices

“…Figure 2(b) shows the AC-susceptibility measurements on the La 0.7 Sr 0.3 MnO 3 /SrRuO 3 superlattices at various frequencies 333, 733, 1033 and 1333 Hz, respectively, in an alternating field of 1 Oe. Measurements were carried out with the field applied parallel to the superlattice surface (in-plane) and were performed after ZFC of the specimen from 300 K. Around 300 K, the value of susceptibility is almost constant as though there is a ferromagnetic transition at high temperature due to the La 0.7 Sr 0.3 MnO 3 layers [17]. Below 150 K, a decrease in the susceptibility is apparent, indicating a strong AFM interlayer coupling.…”

Fe-Ti-O exchange at high temperature and thermal hysteresis

“…The ac susceptibility χ( T ) is a complex function and consists of an in‐phase (real) , and an out‐of‐phase (imaginary) component : . The in‐phase component describes the fundamental susceptibility and the out‐of‐phase the energy dissipations, for example, during magnetic ordering (Prüfer & Ziese 2008). At the onset of magnetic order upon cooling through T C both in‐phase and out‐of‐phase components exhibit a peak due to fluctuations in the spin structure.…”