Correlation Between Composition and Electrodynamics Properties in Nanocomposites Based on Hard/Soft Ferrimagnetics with Strong Exchange Coupling.

Munirah Abdullah Almessiere,F Esa,Yassine Slimani,Sergei V Trukhanov,Abdulhadi Baykal,A Sadaqat,Maxim Zdorovets,K Chaudhary,Ekaterina L Trukhanova,Alex V Trukhanov,K.Y You

doi:10.3390/nano9020202

Munirah Abdullah Almessiere, F Esa + Show 9 more

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https://doi.org/10.3390/nano9020202

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Abstract

In this work, Sr0.3Ba0.4Pb0.3Fe12O19/(CuFe2O4)x (x = 2, 3, 4, and 5) as strongly exchange-coupled nanosized ferrites were fabricated using a one-pot sol–gel combustion method (citrate sol-gel method). The X-ray diffraction (XRD) powder patterns of the products confirmed the occurrence of pure, exchange-coupled ferrites. Frequency dependencies of the microwave characteristics (MW) were investigated using a co-axial method. The non-linear behavior of the MW with the composition transformation may be due to different degrees of Fe ion oxidation on the spinel/hexaferrite grain boundaries and strong exchange coupling during the hard and soft phases.

Highlights

Correlated transition metal oxides exhibit a wide spectrum of unusual electronic and magnetic phenomena [1,2,3] caused by the cooperative effects of charge and spin ordering
These results demonstrate to us that the sol-gel method allowed for the growth of both hard and soft ferrites as strongly exchange-coupled composites [18]
As expected in the range of 8–12 GHz, the highest reflection losses (RL) was found for x = 3 and 5, meaning that the main losses are due to reflection rather than absorption

Summary

Introduction

Correlated transition metal oxides exhibit a wide spectrum of unusual electronic and magnetic phenomena [1,2,3] caused by the cooperative effects of charge and spin ordering. This class of materials demonstrates such quantum phenomena as high-temperature superconductivity [4], Bose-Einstein condensation of magnons [5], and multiferroicity (the coexistence of magnetic and ferroelectric ordering) [6]. The coexistence of two separate magnetic phases may provide strong coupling between them and as a result lead to an improvement of the functional properties [10,11]. The maximal effect in composites can be reached by strong exchange coupling (magnetostatic coupling, intergranular interactions, microstructure effect)

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