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La1xCaxMn3体系的交换偏置效应及铁磁团簇玻璃态行为
Abstract
Abstract
Since the discovery of·the colossal magnetoresistance effect(CMR),the perovskite·like manganites have been studied extensively due to fascinating physical properties derived from the interplay of charge,spin,orbital,and lattice degrees of freedom,as well as their potential applications.As for the exchang bias(EB)effect, not only its potentially technological application in the magnetic devices but also its
mechanism has been an attractive issue among topics of interest.The observation of
EB effect in the manganites gives new insight into the research on the manganites and provides them more opportunities in the field of application.Though many efforts are contributed to the investigations in the EB effect in the manganites,EB effect in the charge ordered manganites is lack of systemic studies.Moreover,the influence of the size effect on the EB effect and the dynamic properties of the ferromagnetic cluster originating from the size effect remain to be unsolved.Aiming at the problems
described above,the dissertion is arranged as follows:
In chapter 1,the research history of perovskite-like manganites and the progresses of the EB effect are concisely introduced.It includes the following main points:the crystal structure and the Jahn—Teller effect,CMR effect and the physical mechanisms such as double exchange interaction,superexchange interaction and the polaron effect,charge ordering(CO)and methods to control the CO state,phase separation and the electronic phase separation,the phase diagrams of Lal-xCaxMn03
and other systems,EB effect and the corresponding theoretical models,EB effects in
the manganites in the form of film,bulk and nanoparticles,as well as the cluster state
in the nanoparticles.
In chapter 2,the EB effect of Lal.xCaxMn03(O.55 5 x≤O.95)compounds Was investigated.The electronic phase separation and structure inhomogeneities probably lead to the occurrences of the FM phases in the systems with antiferromagnetic(AFM) structures.The dc
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