異型復合材料的位移變磁導及電磁效應.pdf

1、南京師范大學碩士學位論文異型復合材料的位移變磁導及電磁效應姓名：王自領申請學位級別：碩士專業(yè)：物理；凝聚態(tài)物理指導教師：張寧20090427AbstractIIAbstractInthispaperelectromagic(EM)effectisdiscussed.EMeffectisthechangeofthemagismofmaterialinducedbyexternalelectricfield.Thisisexactlythe

2、oppositeofthemagoelectric(ME)effectsoEMeffectisalsocalledconversemagoelectric(CME)effect.ByusingtheproducteffectsofelectrostraindisplacementpermeabilityacompositecontainabarofPb(ZrTi)O3twoheterotypicferriteswithdifferent

3、permeabilityhasbeendevelopeditselectromagiceffecthasbeeninvestigated.Firstlyastheresearchsubjucttheferritewhichhasinitialpermeabilitywith500015000hasbeendiscussed.Wefoundthattheinitialpermeabilityexistthebestvalueinheter

4、otypicferritewithdisplacepermeability.displacementpermeabilityintheheterotypemagcouldchangemethan90%whichcanbeobservedataconsiderablewidefrequencyrange.Thenthedisplacementpermeabilityinheterotypeferritecombinedwiththeele

5、ctrostrictiveeffectofPZTwillconstituteheterotypecopositeEMmaterialwhichcanfmaEMdevicebywoundingupcoilontheferrite.Underaconstantelectricfieldof1kVabout36%electricfieldcontrolledpermeabilityimpedancehasbeenobservedinacons

6、iderablywidescopeoffrequency.Theelectricfielddependenceoftheinductanceimpedanceofthecompositedeviceshowsaferroelectricrelaxationbehavi.Analysisshowsthatthedegeneratingfielddependentpermeabilitywasresponsibleftheelectroma

7、giceffectsobserved.Comparedwithearlierstudiestheivityofthematerialisnotstrong.Fmostofthemagicmaterialscanbeobservedthedisplacementpermeabilityelectromagiceffect.thechangeoftheimpedancecausedbythevariationoftheinductancec