Co掺杂对Ni—Mn—Sn铁磁形状记忆合金磁性质的影响-论文.pdf

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1、Availableonlineat、^n^n^，．sciencedirect．com一Transacfionsof繇ScienceDirectNonferrousMetals爱SocietyofChinaPressTrans．NonferrousMet．Soc．China24(201411053—1057www．tnmsc．cnEffectofCosubstitutiononmagneticpropertiesofNi·——Mn。——SnmagneticshapememoryalloysJia—muCAO，Chang—longTAN，Xiao—huaTIAN，Q

2、in．ciLI，Er-junGUO，Li．pingWANG，Yi-jiangCAO1．SchoolofAppliedScience，HarbinUniversityofScienceandTechnology,Harbin150080，China；2．SchoolofMaterialsScienceandEngineering，HarbinUniversityofScienceandTechnology,Harbin150080，ChinaReceived27March2013；accepted15October2013Abstract：TheefrectofC

3、osubstitutiononmagneticpropertiesofNi-Mn—Snshapememowalloywasrevealedbyfirst．principlescalculations．LargemagnetizationdiferenceinNi-Mn—SnalloyobtainedbyadditionofCoarisesfromenhancementofmagnetizationofausteniteduetochangeofMn-Mninteractionfromanti．ferromagnetismtoferromagnetism．Tbta

4、lenergydiferencebetweenparamagneticandferromagneticansteniteplaysanimportantroleinmagnetictransitionofNi-Co-Mn-Sn．ThealteredMn3dstatesduetoCosubstitutiongiverisetodiferenceinmagneticproperties．Keywords：feromagneticshapememo~alloys；Ni——Mn-Sn；first—principlescalculation；magneticpropert

5、iessubstitutionofCoforNiinNi一Ⅳ【n—Snalloysisan1IntrOductiOnefectivewaytoincreasethediferenceinmagnetizationbetweenausteniteandmartensitephases『15，161．0fr．stoichiome仃icNi-Mn-SnferromagneticshapeRecently,themagneticpropertiesofNi—Mn—SnandmemoryalloyshaveattractedgreatinterestduetotheNi—

6、Co—Mn—Snalloyshavebeenstudiedbyneutronobservationsofmagneticfield．inducedreversepowderdiffractionsanditisfoundthattheferromagneticmartensitic仃ansformation『1—41．ThemagnetizationinenhancementinNi—Co-Mn-Snocc~sasresultofthemartensitephaseofthesealloysissmallerthanthatinchangeinthemagnet

7、icstructureduetothesubstitutiontheausteniteone．Ni—Mn—SnalloysundergomartensiticofCo『16]．Sofar,althoughCosubstitutionhastransformationinamagneticallyorderedstate，andtheprominentefectsonmagneticpropertiesandmagneticinterplaybetweenthestructureandmagnetismgivesrisefield．inducedreversema

8、rtensitictra