Low-frequency ferromagnetic resonance in nanocomposite samples of p-La0.78Mn0.99O3.5 and p-La0.80Mn1.04O3.5 manganites
V.L. Ponomarchuk, E.N. Khatsko, and A.V. Yeremenko
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
Received December 24, 2010
Investigations of the low-frequency ferromagnetic resonance spectra of nanocomposite samples of manganites
p-La0.78Mn0.99O3.5 and p-La0.80Mn1.04O3.5 with a cubic perovskite structure and the hole conductivity were studied. The samples were prepared under high pressure (7.5 GPa) in oxygen atmosphere. Temperature dependences of magnetization near the Curie point were obtained. It is found that the characteristic times of the decay of the metastable magnetic phase above T* (metal–semiconductor transition) differ from the time of this phase formation below T*.
PACS: 75.75.+c Magnetic properties of nanostructures; PACS: 75.50.Pp Magnetic semiconductors; PACS: 76.50.+g Ferromagnetic, antiferromagnetic,and ferrimagnetic resonances; spin-wave resonance.