Title :
High-Frequency Magnetic Properties of Manganites La1−xSrxMnO3
Author :
Zheng-Wen Li ; Zhi-Hong Yang
Author_Institution :
Temasek Labs., Nat. Univ. of Singapore, Singapore, Singapore
Abstract :
High-frequency (HF) magnetic properties have been studied for manganites La1-xSrxMnO3 with Sr = 0.2-0.4. The manganites have good HF properties with the real permeability μ0\´ of 50-80, maximum imaginary permeability μmax" of 22-32, and resonance frequency of 10-40 MHz. Two types of resonances are found for La1-xSrxMnO3: one is from domain wall and the other is from natural resonance. With increasing annealing temperature Ta, μ0\´ significantly increases, which is attributed to an increase of density, based on the magnetic circuit model. The frequency fR2 of natural resonance is almost unchanged, but fR1 of wall resonance is shifted to lower frequency that has its origin in the decrease of resistivity.
Keywords :
annealing; electrical resistivity; lanthanum compounds; magnetic domain walls; magnetic permeability; magnetic resonance; strontium compounds; La1-xSrxMnO3; annealing temperature; domain wall; frequency 10 MHz to 40 MHz; magnetic circuit model; manganite high-frequency magnetic properties; maximum imaginary permeability; natural resonance frequency; resistivity; wall resonance; Annealing; Ferrites; Magnetic properties; Permeability; Resonant frequency; Temperature measurement; Magnetic susceptibility; soft magnetic materials;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2014.2331028
