enciu_d__toader_a__ursu_i__vol_6__iss_2基于Mn杂质的磁场纳米传感器

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1、MagneticfieldnanosensorbasedonMnimpurities,111DanielaENCIU*,AdrianTOADER,IoanURSU*Correspondingauthor,1*INCAS−NationalInstituteforAerospaceResearch“ElieCarafoli”B-dulIuliuManiu220,Bucharest061126,Romaniaenciu.daniela@incas.ro*,toader.adrian@incas.ro,ursu.ioan@incas.roDOI:10.13111/20

2、66-8201.2014.6.2.5Abstract:Nanosensorsbasedongraphenenanoribbon,studiedinthepresentwork,couldprovideaspecialinterestin(aero)spaceapplications.Morespecifically,thepaperproposestheconstructionofananosensorbasedonMn(Manganese)impurities.DifferentspinconfigurationsoftheMnatomsareconside

3、red.ThemathematicalmodelusedtodeterminethespintransportisbasedonKohn-Shamequations.Thespin-dependenttransmissionfunctionsarecalculatedusingtheformalismofthenon-equilibriumGreen’sfunctions.TheimplementationofthemathematicalmodelisperformedintheSIESTApackage.Thespintransportproperties

4、aredeterminedusingthefirstprinciplecalculationsusingdensityfunctionaltheory.Thegraphenenanoribbonwithtransitionmetalimpuritiesisbasedonactiveelement–thesystemofspins–whichisinfluencedbytheexternalperturbationfield.Suchnanostructuresmayserveasspatialapplications.Thedifferencesbetween

5、differentexcitedstatesaredeterminedanditisestablishedthattheenergyrangeoverlapsthemid-infraredwavelengths.KeyWords:nanosensors,(aero)spaceapplications,infrareddetection,densityfunctionaltheory(DFT),SIESTApackage.1.INTRODUCTIONIntherecentyears,thereisanincreasinginterestintheapplicat

6、ionsofnanotechnologyinthe(aero)spaceindustry.Thus,thespacestudyusingthequantummechanicswasassumedasanewfieldofresearchbytheEuropeanSpaceAgency(ESA)andbytheOfficeNationald'ÉtudesetdeRecherchesAérospatiales(ONERA)[1].Severalareasofstudywereundertaken,amongwhichwementionthedevelopmento

7、fnanosensors.Oneofthenewmaterialsdevelopedforbuildingthenanosensorsintheframeworkofanewdiscipline,the9spintronics,isthegraphene[2],[3].Inthecontext,theprefix“nano”refersto10physicaldimensionoflengththenanometer(nm),whichisonthescaleofatomicdiameters.Thus,thenanoscienceisinfactthes

8、tudyofatomsandmolec