6362

394 دكتري

دكتري

ماده چگال

اصفهان : دانشگاه صنعتي اصفهان

1390

دوازده،302ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

هادي سلامتي

پرويز كاملي، مايكل كولي

29/8/90

محمد اخوان، محمدعلي شاهزمانيان،پيمان صاحب سرا

1400/04/05

كتابنامه

فيزيك

فيزيك

1400/04/05

ID394 دكتري

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

295 Preparation and Study of Structural Magnetic and Electrical Properties of La1 xSrxMnO3 x 0 33 0 55 Nanostructures Ali Rostamnejdi E mail ali@ph iut ac ir Date of submission 25 July 2011 Department of Physics Isfahan University of Technology Isfahan 84156 83111 IranSupervisor Hadi Salamati salamati@cc iut ac irAdvisor Parviz Kameli and J M D CoeyDepartment Graduate Program Coordinator Farhad Shahbazi AbstractIn this thesis we have studied structural magnetic thermal and electrical properties of La1 xSrxMnO3 x 0 33 0 55 nanostructures nanoparticles and thin films AC susceptibilitymeasurements and memory effect suggest that the nanoparticles of La1 xSrxMnO3 x 0 33 have superparamagnetic behaviour near room temperature Also the magneto transportproperties of nanogranular samples are studied Large low field magnetoresistance andmagnetic field sensitivity are observed A powder sample of this composition shows largeconventional magnetocaloric effect above room temperature Nanoparticles of La1 xSrxMnO3 x 0 55 show unusual ferromagnetic properties and large inversemagnetocaloric effect Cooling field and particle size dependence of exchange bias effecthave been studied The coercivity and exchange bias fields decrease exponentially withcooling field Thin films of La1 xSrxMnO3 x 0 33 show nonlinear transport propertieswith large low field magnetoresistance Keywords manganite nanoparticles thin film magnetocaloric exchange bias superparamagnetism

هادي سلامتي

پرويز كاملي، مايكل كولي

محمد اخوان، محمدعلي شاهزمانيان،پيمان صاحب سرا