ታᣉ⺖㗴⇟ภ㧦2007 A 1914            ૶↪ࡆ࡯ࡓ࡜ࠗࡦ㧦BL25SU

ᒝ⏛ᕈ૕ਛߦᝌ౉ߒߚฦ⒳㕖⏛ᕈ૕ߩಽᭂߣ⏛᳇ᛶ᛫ലᨐߩ⋧㑐
Correlation between the polarization and the magnetoresistance of
non-magnetic materials inserted into ferro-magnetic materials
ේ᤯ᴦ a㧘ᐔ↰੩ a㧘ፉᴛᐘม a㧘ᩉౝసᤘ a㧘㊁ญẖ a㧘⏷਄ᘕੑ b㧘ⷺ↰ආᷡ b㧘ਛ᧛ື਽ c
Shinji Haraa, Kei Hirataa, Kouji Shimazawaa, Katsuaki Yanagiuchia, Kiyoshi Noguchia,
Shinji Isogamib, Masakiyo Tsunodab, Tetsuya Nakamurac
aTDK ᩣᑼળ␠㧘b ᧲ർᄢቇᄢቇ㒮Ꮏቇ⎇ⓥ⑼㔚ሶᎿቇኾ᡹㧘c 㜞ノᐲశ⑼ቇ⎇ⓥ࠮ࡦ࠲࡯
a
TDK corp. , bDept. of Electronic Eng., Grad. School of Eng., Tohoku University, cJASRI

ฦ⒳㕖⏛ᕈጀ㧔Ti, V, Cr, Mn, Cu, Mo, Ru, Pd, Ag㧕ࠍᒝ⏛ᕈጀਛߦ⭯ߊᝌ౉ߒߚ⭯⤑⹜ᢱߦኻߒ XMCD᷹ቯࠍⴕ޿‫ߩߘޔ‬ಽᭂࠍ⷗Ⓧ߽ߞߚ‫৻ޔߚ߹ޕ‬ㇱߩ೨⸥㕖⏛ᕈ૕ࠍᝌ౉ߒߚ CPP-GMR ⚛ሶࠍ૞⵾ߒ‫ޔ‬ಽᭂߣ MR Ყߩ㑐ଥࠍዉ಴ߒߚ‫ޕ‬XMCD ᷹ቯߦ߅޿ߡ᷹ⷰߐࠇࠆಽᭂߣ⏛᳇ᛶ᛫ലᨐߦ⋧㑐߇޽ࠆ੐߇್᣿ߒߚ߇✢ᒻߩ㑐ଥߪߥߊ‫ޔ‬ᝌ౉㕖⏛ᕈ૕ߦ߅ߌࠆࡈࠚ࡞ࡒࠛࡀ࡞ࠡ࡯ㄭறߢߩࡃࡦ࠼ᒻ⁁߇⏛᳇ᛶ᛫ലᨐߩ⊒⃻ߦᄢ߈ߊᓇ㗀ߔࠆน⢻ᕈ߇㜞޿੐߇᣿ࠄ߆ߣߥߞߚ‫ޕ‬In order to estimate the polarization of the multilayered thin film into which non magnetic layers Ti, V, Cr,Mn, Cu, Mo, Ru, Pd, and Ag were laminated, XMCD measurements were performed. Furthermore,CPP-GMR elements with the above-mentioned laminated layers were prepared and the measured MR ratio
was compared with their polarization. The two parameters had a correlation, which is not “liner”, and it wasrevealed that DOS near Fermi energy is very important and might raise MR effects.
⢛᥊ߣ⎇ⓥ⋡⊛㧦 ࡂ࡯࠼࠺ࠖࠬࠢ࠼࡜ࠗࡉߩ㜞ኒᐲൻߦ઻޿‫⏛⤑⭯ޔ‬᳇ࡋ࠶࠼ߩᕈ⢻ะ਄߇ⷐ᳞ߐࠇߡ߅ࠅ‫ߺ⺒ޔ‬಴ߒ↪⏛᳇ᛶ᛫ലᨐ⚛ሶߣߒߡߪ⤑㕙ု⋥ᣇะߦㅢ㔚ߒേ૞ߐߖࠆ࠲ࠗࡊ
ߩ CPP㧔Current Perpendicular to the Plane㧕᭴ㅧࠍᜬߞߚ GMR㧔Giant Magnetoresistive㧕⚛ሶ߇ᰴ਎ઍߩ᦭ജߥ୥⵬ߣߒߡ᜼ߍࠄࠇߡ޿ࠆ‫ޕ‬ਅㇱ㔚ᭂ਄ߦ‫࡯ࠔࡈ࠶ࡃޔ‬ጀ‫ޔ‬෻ᒝ⏛ᕈጀ‫ޔ‬෻ᒝ⏛ᕈጀߦࠃࠅ⏛ൻᣇะ߇࿕ቯߐࠇࠆࡇࡦ࠼ጀ‫ޔ‬㕖⏛ᕈਛ㑆ጀ‫ޔ‬ᄖㇱ⏛႐ߦᔕߓ⏛ൻᣇะ߇⥄↱ߦᄌൻߔࠆࡈ࡝࡯ጀ‫ޔ‬਄ㇱ㔚ᭂࠍ㗅ᰴⓍጀߒߡ᭴ᚑߐࠇߚ‫ ߩߎ߇ࡉ࡞ࡃࡦࡇࠬࠆࠁࠊ޿ޔ‬CPP-GMR⚛ሶߩઍ⴫⊛ߥ᭴ㅧߣߥߞߡ޿ࠆ‫ޕ‬CPP-GMR ߪ዁᧪⊛ߥࡋ࠶࠼ߩᓸ⚦ൻࠍ⠨ᘦߦ౉ࠇߚ႐วߦᄢ߈ߥࡔ࡝࠶࠻ࠍᜬߟ߇‫ޔ‬หߓߊ CPP ᭴ㅧࠍᜬߟ TMR㧔Tunneling Magnetoresistive㧕⚛ሶߦᲧߴ⏛᳇ᛶ᛫㧔MR: Magnetoresistance㧕Ყ߇ૐߊ‫ᦝޔ‬ߥࠆะ਄߇ᷢᦸߐࠇߡ޿ࠆ‫ޕ‬
CPP-GMR ⚛ሶߦ߅޿ߡታ㓙ߦ MR ⊒⃻ࠍᜂ߁ߩߪࡇࡦ࠼ጀߣࡈ࡝࡯ጀߢ޽ࠆ߇‫ޔ‬Co, Fe, Ni ╬ߩ⚵ߺวࠊߖߢ᭴▽ߐࠇࠆ੐߇৻⥸⊛ߢ޽ࠅ‫ޔ‬ߘߩᡷༀߦࠃࠆౕ૕⊛ߥ MR Ყะ਄ᚻᴺߩႎ๔ߪᢙዋߥ޿‫ߩߘޕ‬ਛߩ৻ߟߦ‫ޔ‬㕖⏛ᕈ૕ߢ޽ࠆCu ࠍᒝ⏛ᕈ૕ਛߦ⭯ߊᝌ౉ߔࠆ੐ߦࠃࠅ MR Ყࠍะ਄ߐߖࠆᛛⴚ߇޽ࠆ[1,2]‫ߩߘߒ߆ߒޕ‬ᓸዊ㗔ၞߦ߅޿ߡߤߩࠃ߁ߥේℂߢ MR Ყ߇ะ਄ߔࠆ߆ߦߟ޿ߡߪਇ᣿ߥὐ߇ᄙ޿‫ޕ‬ߎߩ⃻⽎ߩℂ⸃ߩߚ߼ߦߪ‫ޔ‬ᝌ౉ߒߚ㕖⏛ᕈ૕ ߩ ࠬ ࡇ ࡦ ⁁ ᘒ ⸃ ᨆ ߪ ᔅ 㗇 ߢ ޽ ࠅ ‫ ޔ‬XMCD
㧔X-ray Magnetic Circular Dichroism㧕᷹ቯ߇᦭ല
ߢ޽ࠆ‫ޕ‬XMCD ᷹ቯߪౝᲖ㔚ሶๆ෼ᴺ㧔XAS:
X-ray Absorption Spectroscopy㧕ߩ৻⒳ߢ޽ࠅ‫ޔ‬౞஍శࠍ౉኿ߒๆ෼ࠬࡍࠢ࠻࡞ߩ౞ੑ⦡ᕈࠍ᷹ቯߔࠆ੐ߦࠃࠅ‫ޔ‬ฦర⚛ߩ․ቯߣ‫ޔ‬㔚ሶߩ゠㆏ࠍㆬᛯߒߚࡈࠚ࡞ࡒḰ૏ㄭறߩࠬࡇࡦଐሽ㔚ሶ⁁ᘒߩ⋥ធ⊛ߥᖱႎ߇ᓧࠄࠇࠆ‫⺖ᧄޕ‬㗴ߢߪ‫ߎޔ‬ߩࠃ߁ߥ CPP-GMR ⭯⤑↪᧚ᢱߩ㐿⊒ᜰ㊎ࠍᣂߚߦ᭴▽ߔߴߊ‫ޔ‬ᒝ⏛ᕈጀਛߦᷝടߔࠆਇ⚐‛ర⚛ߩ⏛᳇ャㅍ․ᕈߦ෸߷ߔᓎഀࠍ‫⏛ޔ‬᳇ಽᭂߣߩ⋧㑐ߩⷰὐ߆ࠄ᣿ࠄ߆ߦߔࠆߎߣ߇⋡ᮡߣߥࠆ‫ޕ‬ታ㛎㧦 XMCD ᷹ቯߪ SPring-8, BL25SU ߩ㔚⏛⍹
MCD ⵝ⟎ࠍ↪޿ߡⴕߞߚ‫ޕ‬SiN ࡔࡦࡉ࡟ࡦ਄ߦ‫ޔ‬
Ta5.0/Ru5.0/ Fe 70 Co 30 0.5/X0.2 x30/Fe 70 Co30 0.5/
Ru1.0/Ta1.0 㧔X= Ti, V, Cr, Mn, Cu, Mo, Ru, Pd, Ag,ᢙሼߪ nm㧕ߥࠆ᭴ᚑߩᄙጀ⤑ࠍⓍጀߒ‫ޔ‬ㅘㆊᴺ
ߦߡ XAS ߣ XMCD ᷹ቯࠍⴕߞߚ‫ޕ‬エ X ✢ᵄᢙࡌࠢ࠻࡞ߣ㔚⏛⍹⏛⇇ߩᣇะߦߪ 10 ᐲߩફⷺ߇޽ࠅ‫⹜ޔ‬ᢱ㕙߆ࠄ᷹ߞߚශട⏛⇇ߩᣇะߪ 20 ᐲ‫ޔ‬エ X ✢ᵄᢙࡌࠢ࠻࡞ߩᣇะߪ 30 ᐲߣߒߚ‫߅ߥޕ‬᷹ቯߪቶ᷷ߦߡⴕߞߚ‫ޕ‬㕖⏛ᕈ૕㧔Cu, Pd, Mn㧕ߦߟ޿ߡߪࡇࡦ࠼ጀߣࡈ࡝࡯ጀߩᒝ⏛ᕈ૕ਛߦᝌ౉ߒ CPP-GMR ⚛ሶࠍ૞ᚑߒ‫ޔ‬㕙Ⓧᛶ᛫㧔RA: Resistance Area Product㧕ߣ MR ᄌൻಽߦ⋧ᒰߔࠆǍRA ߩ⹏ଔࠍⴕߞߚ‫ޕ‬ߎߩᓧࠄࠇߚಽᭂᖱႎߣ MR ലᨐࠍᲧセߔࠆߚ߼‫ޔ‬Pd, Cu, Mn ᝌ౉ CPP-GMR ⚛ሶߦߟ޿ߡߩRA-ǍRA ᷹ቯ⚿ᨐࠍ␜ߔ㧔Fig.2㧕‫ޕ‬Cu, Pd ߇㜞޿ᝌ౉ലᨐࠍ␜ߔߩߦኻߒ‫߽ᦨޔ‬ᄢ߈ߥಽᭂ୯߇XMCD ᷹ቯߦࠃࠅ␜ߐࠇߚ Mn ߦߟ޿ߡߪ‫ޔ‬ᝌ౉ߦࠃࠅㅒߦǍRA ߩૐᷫ߇⏕⹺ߐࠇߚ‫ࠅ߹ߟޕ‬ᒝ⏛ᕈጀਛߦᝌ౉ߒߚ㕖⏛ᕈ૕ߩಽᭂߣ MR ࠛࡦࡂࡦࠬࡔࡦ࠻ߦߪ✢ᒻߩ⋧㑐߇⹺߼ࠄࠇߥ޿⚿ᨐߣߥߞߚ‫ޕ‬⚿ᨐ߅ࠃ߮⠨ኤ㧦 Fig.1 ߦઍ⴫଀ߣߒߡ Pd, Cu,Mn, Ru ࠍ Fe70Co30 ਛߦᝌ౉ߒߚ⹜ᢱߩ XAS,XMCD ᷹ቯ⚿ᨐ㧔৻ㇱ㧕ࠍ␜ߔ‫ޕ‬Cu, Mn ߪ L3
ๆ෼┵‫ޔ‬Pd, Ru ߪ M3 ๆ෼┵ߩ XAS ᒝᐲࠍరߦMCD ࠍ▚಴ߒߚ⚿ᨐ㧔XAS ߩว⸘ࡇ࡯ࠢ㜞ߐߦኻߔࠆ஍శߦࠃࠆᏅಽ㧕ࠍ Table ߦ⴫ߔ‫ޕ‬MCD
ߪ Mn ߦߟ޿ߡᦨ߽ᄢ߈ߊ‫ޔ‬㗅ߦ Pd, Cu, Ru ߣߥࠆ‫ޕ‬Ru ߦ߅޿ߡߪಽᭂ߇ోߊ᷹ⷰߐࠇߥ߆ߞߚ‫ޕ‬㰱㪩㪘 㩷㩿㫄㫆㪿㫄㩷㫌㫄㪉㪀㪈㪅㪉㪈㪅㪇㪇㪅㪏㪧㪻㩷㫃㪸㫄㫀㫅㪸㫋㪼㪻㪚㫌㩷㫃㪸㫄㫀㫅㪸㫋㪼㪻㪤㫅㩷㫃㪸㫄㫀㫅㪸㫋㪼㪻㫅㫆㩷㫃㪸㫄㫀㫅㪸㫋㪼㪻㪇㪅㪍㪇㪅㪋㪇㪅㪉㪇㪅㪇㪋㪌Pd㪌㪇㪌㪌㪉㪩㪘 㩷㩿㫄㫆㪿㫄㩷㫌㫄 㪀CuFig.2 ǍRA vs. RA plots of CPP elements with laminated㪯㪘㪪㩿㫌㪄㪀㪯㪘㪪㩿㫌㪂㪀㪯㪤㪚㪛㪯㪤㪚㪛㩷㩿㪸㪅㫌㪅㪀

non-magnetic materials Pd, Cu, Mn
Cu
L3㪯㪘㪪㩷㩿㪸㪅㫌㪅㪀

OK㪯㪘㪪㩿㫌㪄㪀㪯㪘㪪㩿㫌㪂㪀㪯㪤㪚㪛㪯㪤㪚㪛㩷㩿㪸㪅㫌㪅㪀㪯㪘㪪㩷㩿㪸㪅㫌㪅㪀

Pd
M3

Pd
M2
CuL2
㪌㪊㪇㪌㪋㪇㪌㪌㪇㪌㪍㪇㪧㪿㫆㫋㫆㫅㩷㪜㫅㪼㫉㪾㫐㩷㩿㪼㪭㪀㪌㪎㪇㪐㪉㪇㪯㪘㪪㩿㫌㪄㪀㪯㪘㪪㩿㫌㪂㪀㪯㪤㪚㪛㪯㪘㪪㩷㩿㪸㪅㫌㪅㪀㪯㪘㪪㩷㩿㪸㪅㫌㪅㪀

Mn
L3

Ru
M3

Mn
L2

㪍㪊㪇㪐㪎㪇Ru㪯㪤㪚㪛㩷㩿㪸㪅㫌㪅㪀Mn㪐㪊㪇㪐㪋㪇 㪐㪌㪇㪐㪍㪇㪧㪿㫆㫋㫆㫅㩷㪜㫅㪼㫉㪾㫐㩷㩿㪼㪭㪀

㪍㪋㪇
㪍㪌㪇
㪍㪍㪇
㪧㪿㫆㫋㫆㫅㩷㪜㫅㪼㫉㪾㫐㩷㩿㪼㪭㪀㪯㪘㪪㩿㫌㪄㪀㪯㪘㪪㩿㫌㪂㪀㪯㪤㪚㪛㪯㪤㪚㪛㩷㩿㪸㪅㫌㪅㪀

㪌㪉㪇RuM2㪍㪎㪇㪋㪌㪇㪋㪍㪇㪋㪎㪇 㪋㪏㪇㪋㪐㪇㪧㪿㫆㫋㫆㫅㩷㪜㫅㪼㫉㪾㫐㩷㩿㪼㪭㪀㪌㪇㪇Fig.1 XAS and XMCD spectra of Fe70Co30 with laminatednon-magnetic materials Pd, Cu, Mn, Ru
Table Polarization of Fe70Co30 with laminated non-magnetic
materials Pd, Cu, Mn, Ru

Ti

4.9 Mn15.0 Ru

0V

7.6 Cu7.9 Pd

11.0Cr

3.1 Mo0 Ag

0Fig.3 ߦ Cu, Fe, Mn ߦ߅ߌࠆࡈࠚ࡞ࡒࠛࡀ࡞ࠡ࡯㧔EF㧕ㄭறߩ DOS 㧔Density of States㧕ࠍ␜ߔ‫ޕ‬ߥ߅⭯ߊᝌ౉ߒߚጀߩ⚿᥏᭴ㅧߪᲣᒝ⏛ᕈጀߩ᭴ㅧߣ৻⥌ߔࠆߣ⠨߃ࠄࠇࠆߚ߼‫ޔ‬Cu ߣ Mn ߪbcc ߢ޽ࠆߣ઒ቯߒߚ਄ߢߩ⸘▚⚿ᨐߢ޽ࠅ‫ޔ‬Cu,Fe, Mn ߩᩰሶቯᢙߪߘࠇߙࠇ 2.87, 2.83, 2.83Έߣߒߡ⸘▚ߒߚ‫ޕ‬Cu ߩ DOS ߦ⌕⋡ߔࠆߣ‫ޔ‬d 㔚ሶ⁁ᘒߪ EF ࠃࠅࠛࡀ࡞ࠡ࡯⊛ߦᷓ޿૏⟎ߦዪ࿷ൻߒߡ޿ࠆ੐߇ℂ⸃ߐࠇࠆ‫ޕ‬Fe ߣ㓞ធߐߖࠆ੐ߦࠃࠅ‫ޔ‬downspin 㔚ሶ㧔eω㧕ߦߟ޿ߡߪ Fe ߩ 3d ゠㆏ߣ Cu ߩ4s ゠㆏߇ᷙᚑߒ‫ޔ‬EF ㄭறߩ⁁ᘒኒᐲ߇Ⴧߔ‫ޕ‬upspin 㔚ሶ㧔eχ㧕ߦߟ޿ߡߪᷙᚑ߇ᒙߊ㧔Fe ߩ eχߩࠛࡀ࡞ࠡ࡯߇ૐ޿੐ߦࠃࠆ㧕‫ޔ‬EF ㄭறߩ⁁ᘒኒᐲߪଐὼૐ޿߹߹ߢ޽ࠆ‫ޕ‬৻ᣇ Mn ߩ DOS ߪ Fe ߩ߽ߩߣᄢᏅή޿ߚ߼‫ޔ‬ᷙᚑߦࠃࠆ⁁ᘒኒᐲߩᄌൻߪዊߐߊ eχߩ⁁ᘒ߇⧯ᐓૐࠛࡀ࡞ࠡ࡯஥ߦ⒖ⴕߔࠆߩߺߢ޽ࠆߣ⠨߃ࠄࠇࠆ‫ޕ‬એ਄ߩផ᷹ࠃࠅ‫ޔ‬Fe rich FeCo ਛߦ Cu,Mn ࠍᝌ౉ߒߚ㓙ߩ Cu, Mn ߩ੍᷹ DOS ࠍ࿑ߦ⴫ߒߚ߽ߩ߇ Fig.4 ߣߥࠆ‫ޕ‬Cu ߩ႐วߪ਄ㅀߒߚࠃ߁ߦ‫ޔ‬4s ゠㆏ߩ eω߇ࠃࠅᒝߊᷙᚑߦࠃࠆᓇ㗀ࠍฃߌࠆߎߣ߆ࠄ‫ޔ‬eχߩᛶ᛫₸㧔ǹχ㧕ߣ eωߩᛶ᛫₸㧔ǹω㧕ࠃࠅ⸘▚ߐࠇࠆࡄ࡜ࡔ࡯࠲ǩߪ‫ޔ‬ǩ=ǹω/ǹχ㧪㧝ߣߥࠆ‫ޕ‬
FeCo ߩǩ߽ǩ㧪㧝ߢ޽ࠆ੐߆ࠄ‫ޔ‬Cu ߩᝌ౉ߦCuࠃࠅ FeCo ߩಽᭂ߇ࠛࡦࡂࡦࠬߐࠇࠆน⢻ᕈߪ㜞޿‫ ߡߒߘޕ‬MR Ყߪ 1-ǩ 2/ 1+ǩ 2 ߢ⴫ߐࠇࠆߎߣ߆ࠄ‫ޔ‬㜞 MR Ყ⊒⃻ߦ➁߇ࠆ‫৻ޕ‬ᣇ Fig.4
ਛߩ EF ࠃࠅ㜞ࠛࡀ࡞ࠡ࡯ߩ㕖භ᦭゠㆏ߪ eω߇majority ߢ޽ࠅ㧔ᢳ✢ㇱ㧕‫ޔ‬XMCD ᷹ቯߦࠃࠅಽᭂ߇⏕⹺ߐࠇࠆ੐߇ℂ⸃ߢ߈ࠆ‫ޔߦ߁ࠃߩߎޕ‬Cu ߦ߅޿ߡߪ”MCDоMR Ყ”ߩ㑐ଥ߇ᄢಠᚑࠅ┙ߟ੐ࠍ⺑᣿ߒᓧࠆ‫ޕ‬Mn ߦߟ޿ߡߪ Fe ߣ㓞ធߐߖߡ߽ DOS ߦᄢ߈ߥᄌൻߪή޿ߎߣ߆ࠄ‫ޔ‬නጀߩ႐วߣหߓߊǩ㧨㧝ߢ޽ࠆน⢻ᕈ߇㜞޿‫ ߪࠇߎޕ‬Fe ߳ߩ Mn ᝌ౉߇ FeCo ߩǩࠍ㧝ߦㄭߠߌࠆᠲ૞ߦ╬ߒ޿੐ࠍᗧ๧ߒ‫ޔ‬MR Ყ߇ૐਅߒߚℂ↱ߣߥࠅᓧࠆ‫ޕ‬
Fig.4 ߦ␜ߐࠇߡ޿ࠆࡕ࠺࡞߆ࠄߪౝᲖ㔚ሶߩബ⿠߇ eω゠㆏ߦਥߦ⿠ߎࠆ੐߇੍ᗐߐࠇ㧔࿑ਛᢳ✢ㇱ㧕‫ޔ‬MCD ߪ㜞޿ᢙ୯ࠍ␜ߔ੐߇੍ᗐߐࠇࠆ‫ޕ‬ߟ߹ࠅ‫ޔ‬Mn ߦߟ޿ߡߪ”MCDоMR Ყ”ߩ㑐ଥߪᚑࠅ┙ߚߥ޿ߩߢ޽ࠈ߁‫ޕ‬

DOS

up

-0.6-0.4-0.2

00.20.4

ddown

EFs, pEnergy [Ry]

FeDOS

up

-0.6-0.4-0.2

00.20.4એ਄ߩ᭽ߦ‫ޔ‬Cu ╬ߩ㕖⏛ᕈ૕ࠍᒝ⏛ᕈ૕ਛߦ⭯ߊᝌ౉ߒߚ CPP-GMR ⚛ሶߦ߅ߌࠆ MR Ყߩะ਄ߪ‫ޔ‬XMCD ᷹ቯߦࠃߞߡ᷹ⷰߐࠇࠆಽᭂߩ਄᣹ߣ⋧㑐߇޽ࠆ੐߇᣿ࠄ߆ߣߥߞߚ‫ߪࠇߎޕ‬CPP-GMR ⚛ሶ᧚ᢱ㐿⊒ࠍࠨࡐ࡯࠻ߔࠆ᷹ቯᚻᴺߣߒߡ XMCD ߇㕖Ᏹߦ᦭ലߢ޽ࠆ੐ࠍ␜ߔ‫ޕ‬৻ᣇߢ‫ޔ‬ಽᭂ₸ߣ MR Ყࠍ⋥ធ㑐ㅪઃߌࠆߚ߼ߦߪ‫ᧄޔ‬ႎ๔ߢ␜ߒߚࠃ߁ߦࡃࡦ࠼᭴ㅧࠍ⠨ᘦߒߚ⸃ᨆ߇ਇนᰳߢ޽ࠆ੐߽᣿ࠄ߆ߣߥߞߚ‫ޕ‬ds, pdown

EF
Energy [Ry]MnDOSup

-0.6

-0.4

-0.2

00.2

0.4

ds, pdown

EF
Energy [Ry]Fig.3 Calculated total DOS of bcc-structured Cu, Fe andMn.

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ෳ⠨ᢥ₂㧦
[1] H Yuasa et al., J. Magn. Magn. Mat., 286, 2005 .
[2] S. Isogami et al., ISAMMA2007 proc., 267 2007 .

MnCuDOSDOSup

down

EF
Energy੹ᓟߩ⺖㗴㧦 ᧄ⺖㗴ߦࠃࠅ‫ޔ‬XMCD ᷹ቯ⚿ᨐߣࡃࡦ࠼᭴ㅧߩ൮᜝⊛ߥ⠨ኤ߇‫⏛ޔ‬᳇ᛶ᛫╬ߩലᨐࠍ⠨ኤߔࠆ਄ߢᔅⷐߢ޽ࠆ੐߇᣿ࠄ߆ߣߥߞߚ‫੹ޕ‬ᓟߪ‫ޔ‬ᒝ⏛ᕈ⭯⤑⹜ᢱਛߦᷝടߒߚਇ⚐‛ర⚛ߩ⏛᳇ಽᭂߩᄢ߈ߐࠍ‫ޔ‬Უᒝ⏛ᕈว㊄ߩ⚵ᚑߥࠄ߮ߦᷝടర⚛Ớᐲߩ㑐ᢙߣߒߡ⸘᷹ߒߚ޿‫ߩࠄࠇߎޕ‬᷹ቯߣ MR Ყ‫࠼ࡦࡃޔ‬᭴ㅧ⸃ᨆࠍ⚵ߺวࠊߖࠆ੐ߦࠃࠅ‫ޔ‬ਇ⚐‛ర⚛ߩ⏛᳇ಽᭂߩᄢ߈ߐࠍ᳿߼ࠆ‛ℂ࿃ሶߥࠄ߮ߦߘߩነਈߩ᣿⏕ൻ߇น⢻ߦߥࠆߣ⠨߃ࠄࠇࠆ‫ޕ‬

downEFEnergy

Fig.4 Schematic images of total DOS of bcc-structured Cu
and Mn laminated in Fe.

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