Title :
Ferromagnetic resonance and magnetization studies on ferrimagnetic double perovskites A2FeReO6 (A=Ca, Sr, Ba)
Author :
Lofland, S.E. ; Scabarozi, T. ; Kale, S. ; Bhagat, S.M. ; Ogale, S.B. ; Venkatesan, T. ; Greene, R.L. ; Gopalakrishnan, J. ; Ramesha, K.
Author_Institution :
Dept. of Chem. & Phys., Rowan univ., Glassboro, NJ, USA
fDate :
7/1/2001 12:00:00 AM
Abstract :
We present the results of an investigation of the magnetic properties of A2FeReOe (A=Ca, Sr, Ba). We have studied the magnetization, high-temperature susceptibility and the ferromagnetic resonance response. The Ba and Sr systems are conducting while the Ca material is an insulator. The ordering temperature of the Ca materials is highest (~540 K) and decreases to 315 K for the Ba system. The high-temperature susceptibility suggests a large moment, and the Curie-Weiss temperature is very close to the ordering temperature, as expected for a simple ferromagnet, although the ferromagnetic moment is somewhat less than expected. The spin dynamics are rather peculiar: the ferromagnetic resonance results suggest a magnetically inhomogeneous material. We discuss these results in terms of cation disorder
Keywords :
barium compounds; calcium compounds; ferrimagnetic materials; ferromagnetic resonance; magnetic moments; magnetic susceptibility; magnetisation; strontium compounds; 314 to 540 K; A2FeReO6; Ba2FeReO6; Ca2FeReO6; Curie-Weiss temperature; Sr2FeReO6; cation disorder; ferrimagnetic double perovskites; ferromagnetic moment; ferromagnetic resonance; high-temperature susceptibility; magnetically inhomogeneous material; magnetization; ordering temperature; spin dynamics; Conducting materials; Ferrimagnetic materials; Insulation; Magnetic materials; Magnetic properties; Magnetic resonance; Magnetic susceptibility; Magnetization; Strontium; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
