異型復(fù)合材料的位移變磁導(dǎo)及電磁效應(yīng).pdf

1、南京師范大學(xué)碩士學(xué)位論文異型復(fù)合材料的位移變磁導(dǎo)及電磁效應(yīng)姓名：王自領(lǐng)申請學(xué)位級別：碩士專業(yè)：物理；凝聚態(tài)物理指導(dǎo)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