Complex impedance spectroscopy studies of (La0.70−xNdx)Sr0.30Mn0.70Cr0.30O3 (x≤0.30) perovskite compounds

2011 ◽  
Vol 406 (11) ◽  
pp. 2172-2176 ◽  
Author(s):  
Sami Kallel ◽  
Ammar Nasri ◽  
Nabil Kallel ◽  
Hedi Rahmouni ◽  
Octavio Peña ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Complex Impedance ◽  
Complex Impedance Spectroscopy ◽  
Spectroscopy Studies

MICROSTRUCTURAL, MAGNETIC, MAGNETO-TRANSPORT, AND COMPLEX IMPEDANCE SPECTROSCOPY OF xLa0.7Sr0.3MnO3–(1-x)ErMnO3 MULTIFERROIC (0≤x≤1) COMPOSITES

2009 ◽  
Vol 23 (24) ◽  
pp. 4889-4905 ◽  
Author(s):  
P. DEY ◽  
T. K. NATH ◽  
S. K. MANDAL ◽  
A. DAS
Keyword(s):  
Impedance Spectroscopy ◽  
Grain Boundary ◽  
Complex Impedance ◽  
Complex Impedance Spectroscopy ◽  
Relaxation Processes ◽  
Magnetic Domains ◽  
Spin Polarized ◽  
Pinning Center ◽  
Grain Boundary Pinning ◽  
Spectroscopy Studies

We have investigated magnetization, magneto-transport, and complex impedance spectroscopy of structurally characterized multiferroic composites x La 0.7 Sr 0.3 MnO 3 (LSMO)–(1-x) ErMnO 3 (EMO) (0≤x≤1). Para- to ferromagnetic Curie temperatures for this series of composites indicate almost complete immiscibility within the mixture of those two compounds of LSMO and EMO having nearly identical chemical formula. Magnetization as a function of magnetic field curves at T=300 K exhibit an appreciable enhancement of coercive field of LSMO in the composites with increase in EMO content. This feature has been attributed to the increasing grain boundary pinning center of LSMO grains at their interfaces in the composites. Magneto-transport measurements reveal a considerable decrease in spin polarized tunneling transport with increase in EMO content in the composites. This feature is understood as a consequence of increasing grain boundary pinning centers of magnetic domains of LSMO grains in the composites. Room temperature complex impedance spectroscopy studies, i.e., -Z′′ versus Z′ curves (Nyquist plots) for EMO, x=0.1, x=0.2, and LSMO samples reveal that relaxation time of both bulk and grain boundary increases with increase in EMO content in the composites. Slow relaxation processes of conduction electrons at both bulk and grain boundary occurs due to the proximity of highly resistive insulating EMO in the composites.

Synthesis, structural and complex impedance spectroscopy studies of Ni0.4Co0.4Mg0.2Fe2O4 spinel ferrite

2017 ◽  
Vol 90 (10) ◽  
pp. 942-954 ◽  
Author(s):  
Ahmed Selmi ◽  
Sobhi Hcini ◽  
Hedi Rahmouni ◽  
Aref Omri ◽  
Mohamed Lamjed Bouazizi ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Spinel Ferrite ◽  
Complex Impedance ◽  
Complex Impedance Spectroscopy ◽  
Spectroscopy Studies
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