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时间:2020-03-29
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1、铁磁性薄膜中SpinVortex微观磁构形的加垂直磁场钉扎研究物理教育0401吴香凯指导教师:苏垣昌摘要:采用外加圆形小区域垂直强磁场的方法,对模型分别为,,的铁磁性薄膜中出现的SpinVortex自旋构形进行控制和钉扎。首先在水平外场h0=0的情况下,对于模型,取磁偶极相互作用系数2、ortex自旋构形才会被破坏或者变得不够理想;再将圆心逐渐偏离正方形中央位置,看SpinVortex自旋构形的中心是否跟着相应地偏离。然后令外场h0=0.4,外加圆形小区域垂直强磁场对16x16x4模型进行钉扎,并与钉扎之前对比,讨论钉扎的效果。b5E2RGbCAP关键词:磁多层膜,微观磁构形,SpinVortex自旋构形,漂移,钉扎Abstract:PlusingasmallcircularregionofstrongverticalmagneticfieldtopintheSpinp1EanqFDPwvortexs3、pinconfigurationshapedbythemodelofferromagneticfilmswith,,DXDiTa9E3d.Firstofall,inzeromagneticfieldrespectlyas。forthemodel5PCzVD7HxAof,asigningwas。forthemodelof,asigningwas,thenjoininga4、smallcircularregionofstrongverticalmagneticfieldtojLBHrnAILgcontrolthem:firstletmagneticfieldlocateinthecentralofthesquare,graduallyincreasethexHAQX74J0Xradiusofcircularregionofstrongverticalmagneticfield,toseewhenhowmuchtheradiusLDAYtRyKfE37/37reachto,Spinvorte5、xspinconfigurationofthedifferentmagneticdipoleinteractioncoefficientZzz6ZB2Ltkwillbedestroyedorbecomesnotideal。ThengraduallydepartthecentralofthecircularfromdvzfvkwMI1thecentralofthesquare,toseewhetherthecentreoftheSpinvortexspinconfigurationrqyn14ZNXIcorrespond6、inglydepartsfromthecentreofthesqure.Thenwhenthemagneticfieldh0=0.4,EmxvxOtOcopulsingasmallcircleregionofstrongverticalmagneticfieldon16x16x4modeltopinitandSixE2yXPq5comparetothatbeforepinning,disscusingtheeffectofpinning.6ewMyirQFLKeyword:Magneticmultilayers,Mic7、roscopicmagneticconfiguration,Spinvortexspinconfiguration,Drift,pinningkavU42VRUs目录摘要………………………………………………………………………………………………1关键词……………………………………………………………………………………………1第一章引言…………………………………………………………………………………4一.低维磁性体系的研究现状………………………………………………………4二.铁磁或反铁磁磁多层膜微观自旋构形的研究现状及应用价值…8、……………4三.本论文研究的内容和意义………………………………………………………5第二章自旋动力学模拟方法……………………………………………………………6第三章自旋动力学程序模拟计算结果……………………………………………………11一.外加圆形区域小面积垂直强磁场控制无水平外场下的SpinVortex自旋构形………………………………
2、ortex自旋构形才会被破坏或者变得不够理想;再将圆心逐渐偏离正方形中央位置,看SpinVortex自旋构形的中心是否跟着相应地偏离。然后令外场h0=0.4,外加圆形小区域垂直强磁场对16x16x4模型进行钉扎,并与钉扎之前对比,讨论钉扎的效果。b5E2RGbCAP关键词:磁多层膜,微观磁构形,SpinVortex自旋构形,漂移,钉扎Abstract:PlusingasmallcircularregionofstrongverticalmagneticfieldtopintheSpinp1EanqFDPwvortexs
3、pinconfigurationshapedbythemodelofferromagneticfilmswith,,DXDiTa9E3d.Firstofall,inzeromagneticfieldrespectlyas。forthemodel5PCzVD7HxAof,asigningwas。forthemodelof,asigningwas,thenjoininga
4、smallcircularregionofstrongverticalmagneticfieldtojLBHrnAILgcontrolthem:firstletmagneticfieldlocateinthecentralofthesquare,graduallyincreasethexHAQX74J0Xradiusofcircularregionofstrongverticalmagneticfield,toseewhenhowmuchtheradiusLDAYtRyKfE37/37reachto,Spinvorte
5、xspinconfigurationofthedifferentmagneticdipoleinteractioncoefficientZzz6ZB2Ltkwillbedestroyedorbecomesnotideal。ThengraduallydepartthecentralofthecircularfromdvzfvkwMI1thecentralofthesquare,toseewhetherthecentreoftheSpinvortexspinconfigurationrqyn14ZNXIcorrespond
6、inglydepartsfromthecentreofthesqure.Thenwhenthemagneticfieldh0=0.4,EmxvxOtOcopulsingasmallcircleregionofstrongverticalmagneticfieldon16x16x4modeltopinitandSixE2yXPq5comparetothatbeforepinning,disscusingtheeffectofpinning.6ewMyirQFLKeyword:Magneticmultilayers,Mic
7、roscopicmagneticconfiguration,Spinvortexspinconfiguration,Drift,pinningkavU42VRUs目录摘要………………………………………………………………………………………………1关键词……………………………………………………………………………………………1第一章引言…………………………………………………………………………………4一.低维磁性体系的研究现状………………………………………………………4二.铁磁或反铁磁磁多层膜微观自旋构形的研究现状及应用价值…
8、……………4三.本论文研究的内容和意义………………………………………………………5第二章自旋动力学模拟方法……………………………………………………………6第三章自旋动力学程序模拟计算结果……………………………………………………11一.外加圆形区域小面积垂直强磁场控制无水平外场下的SpinVortex自旋构形………………………………
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