Magnetism. 1 Paramagnetism. 2 Magnetic order. Introduction. Technology. Our first contact with magnetism. Plasma spectroscopy, Zeeman effect
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1 agnetm Introducton magnetm nothng new... Paramagnetm agnetc order Our frt contact wth magnetm Technoogy agnetc Reonance Imagng Pama pectrocopy, Zeeman effect
2 Qu. What are the three ource of atomc magnetm and ort them by e.ucear pn moment?.eectron pn moment.orbta moment. What Len aw? Len aw (8: The nduced current produced n the conductor away fow n uch a drecton that the magnetc fed t produce w oppoe the change that produce t.?. How arge the magnetc fed you can generate wth: aa refrgerator magnet ban ron horehoe magnet ca uperconductng magnet. Whch matera react tronget on an apped magnetc fed? aargon ba co dfe Ferromagnetm of the eement Room-temperature magnet A other eement are: Paramagnetc or Damagnetc 8 dfferent type of magnetc matera Temperature dependence of magnetc uceptbty ( H, T = χ ( T H m T T C χ m (T Ferromagnetm or Ferrmagnetm Paramagnetm of ocaed eectron Antferromagnetm Paramagnetm of free eectron Damagnetm T ame and defnton H: magnetc fed / magnetc fed trength : magnetc nducton / magnetc fed In vacuum atera n magnetc fed H agnetaton agnetc uceptbty K m =reatve permeabty = H = ( H + = tot V = χ m H = K m H χ m = K m 9 atera Paramagnetc Iron oxde (FeO Iron amonum aum Uranum Patnum Tungten.8 Ceum. Aumnum. Lthum. agneum. Reatve o C χ m=k m- (x - Sodum. Oxygen ga.9 atera Damagnetc Ammona -. χ m=k m- (x - muth -. ercury -.9 Sver -. Carbon (damond -. Carbon (graphte -. Lead -.8 Sodum chorde -. Copper -. Water -.9 Paramagnetc uceptbty of ocaed eectron = χ(t H χ> parae to H Attractve force Lage T/hoog ved: Veradgd moment /T (T/K
3 ocaed eectron Champon n ocaaton: RE f he Some vaence he e deep n the atom have tte overap wth neghbor atom atomc orbta moment urvve band formaton Whch eectron of the eement are thee: Rare earth: Eectron confguraton f d Thu three open vaence he! Rada expectaton vaue of hydrogen orbta d tranton meta f Rare-earth meta f Eary actnde tte overap wth neghbor atom agnetc dpoe moment of atom wth eectron: Eectron ha pn and orbta moment contrbutng each to the magnetc dpoe moment orbt e = r p = m eh = = 9.x m /T = r x p = g pn g =. = ( (p (d Orbta moment n fed // ax, = = m (f m = = = Zeeman energy Orbta moment n magnetc fed. = m, = g Spn moment n fed // a = g m g =. h ± h Zeeman energy. = g m 8
4 Spn-orbt nteracton Spn-orbt pttng Spn orbt nteracton ead to pttng of eve Spn-orbt energy E pn orbt ucear reference frame = λ Z λ ~ n ( + ( + Eectron reference frame: rotatng proton produce magnetc fed (Reatvtc effect for tate wth quantum number n, : o pttng f = ( orbta Increae wth Z, decreae wth n, - mev for vaence he - ev for nner he ew egentate wth quantum number j=+ or j=- m j =j,j-, -j Labeng: j 9 Tota moment of vaence he n The tota magnetc moment the um of a magnetc dpoe moment ( L + S = hl = h Tota atomc orbta-moment = Tota atomc pn-moment hs = h = Fu he have no dpoe moment: n, np, nd, nf Party fed he have permanent dpoe moment Confguraton ~ ev - ev utpet pttng of np confguraton +Couomb nteracton Spectrocopc notaton: S+ L +Spn-orbt nteracton +magnetc fed (Zeeman pttng utpet tate Hund rue ground tate (here = Coupng cheme for addng orbta and pn anguar momenta. Rue Saunder or L-S coupng f pn-orbt nteracton weak egentate of the atom are ao egentate of L and S wth egenvaue L(L+ and S(S+. Add up a orbta moment Add up a pn moment L = S = Add thee together to tota atomc anguar moment =L+S = = Coupng cheme for addng orbta and pn anguar moment. j-j coupng f pn-orbt nteracton domnant Add up orbta and pn moment of each eectron = + Add thee together to = =. Intermedate coupng compcated no fxed rue
5 Hund rue for of ground tate Procedure for of the ground tate (L-S coupng:. axme S=Σ,. axme L =Σ,. = L-S for e than haf fed he L+S for more than haf fed he f ubhe exacty haf-fed, fed, L=, o = S exampe: d tranton meta: F the d orbta (=..... d S L # eectron Zeeman effect for tate wth tota moment Ground tate + tme degenerated: =-, -+, Spt n magnetc fed nto ubeve ΔE = g L - - H = = Spectrocopc pttng factor g Landee depend on L, S, and Spttng at = Tea n the order of mev Atom behave a f t ha effectve moment: eff =-g L P E =< H >= g g Lande P Lande L( L + S ( S + = ( + Effectve moment often caed m once we have,, we can get the maxmum component of the magnetc moment of the atom parae to the magnetc fed: Confguraton utpet + magnetc fed: Zeeman effect +Couomb nteracton +Spn-baan nteracton +magnetc fed (Zeeman pttng g, Landé pttng factor: pure orbta moton =, pure pn = Typcay ev Spttng typcay mev Here: = ground tate non-magnetc nget 8 = Temperature dependence ΔE = g L - - magnetc moment of ytem wth on at T determned by otmann tattc: g g exp( k = T = g exp( k T g (, T = g k T roun functon aturated moment /T (T/K 9 g (, T = g k T for not too ma T: Cure aw p χ m ( T = k T [ ( + ] p = glandee Effectve number of magneton Cure aw χ m (T T /T (T/K T
6 How we work Hund rue? Effectve number magneton 8 p = g f Landee [ ( + ] p_ p_mea # eectron 8 d p_ p_s p_mea # eectron p S = [ S( S + ] Paramagnetm of band eectron Up to now: ocaed eectron When vaence eectron form a band, orbta moment quenched Yet we ee a paramagnetc moment n meta Expaned by Wofgang Pau In d tranton meta deocaaton detroy orbta moment (quenchng Paramagnetm of free eectron ga Suceptbte are ma g ( ε F ΔE = Fed ft pn degeneracy Etmate: Δn = g ( ε ( χ( T = = g εf H Pau paramagnetm Temperature ndependent F a uceptbty (m kg - Room temperature uceptbte of frt eement Typca denty:. mo/cm oar uc. χ mo = - <<
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