Ferromagnetic resonance linewidths of MnCd ferrites: Effect of eddy-current processes

被引：4
|
作者：
Torres, L
Flores, AG
Zazo, M
Ferreira, AR
Furtado, CS
Perdigao, JM
deFrancisco, C
Rivas, J
机构：
[1] UNIV COIMBRA,DEPT ENGN ELECTROTECN,CTR ELECTROTECN,INIC,P-3000 COIMBRA,PORTUGAL
[2] UNIV VALLADOLID,DEPT ELECT & ELECTRON,E-47071 VALLADOLID,SPAIN
[3] UNIV SANTIAGO DE COMPOSTELA,DEPT FIS APLICADA,E-15706 SANTIAGO,SPAIN
来源：
PHYSICA STATUS SOLIDI A-APPLIED RESEARCH | 1996年 / 153卷 / 01期
关键词：
D O I：
10.1002/pssa.2211530121
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The ferromagnetic resonance linewidth is measured at 11 GHz from 77 to 300 K for polycrystalline MnxCd0.5Fe2.5-xO4 ferrites with 0.4 less than or equal to x less than or equal to 10.6. The influence of the cooling procedure is also analyzed. Ferromagnetic resonance linewidths are fitted according to the classical contributions of porosity, anisotropy, and eddy-current losses. Linewidths around 400 Oe are found for x = 0.5 in the whole temperature interval. Linewidth broadening due to anisotropy is detected for x > 0.5 at low temperatures. Eddy-current losses take place at high temperatures for x < 0.5. These eddy-current losses are minimized by slow cooling. Activation energies of 0.094 eV are obtained for these conduction processes, in good agreement with previous impedance spectroscopy measurements.
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页码：213 / 222
页数：10
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