   2011A1739         BL25SU

㧗☢ሙ㌾ X ⥺ MCD ࡟ࡼࡿࢿ࢜ࢪ࣒☢▼⤖ᬗ⢏⏺ࡢ㑅ᢥⓗ☢Ẽᵓ㐀ゎᯒMagnetic properties of Nd-Fe-B- based magnets near grain boundaryobserved with a high magnetic field soft x-ray MCD techniqueᗈἑ ဴ a, ୰ᮧ ဴஓ b, ῝ᕝ ᬛᶵ a, すෆ Ṋྖ a, 㬆ᾏ ᗣ㞝 c, 㔝ᑼ ᾈஅ c
Satoshi Hirosawaa, Tetsuya Nakamurab, Tomoki Fukagawaa, Takeshi Nishiuchia,
Yasuo Narumic, Hiroyuki Nojiricaa᪥❧㔠ᒓ㻔ᰴ㻕, b㻔㈈㻕㧗㍤ᗘග⛉Ꮫ◊✲ࢭࣥࢱ࣮, c ᮾ໭኱ᏛHirachi Metals, Ltd., bJapan Synchrotron Radiation Research Institute, cTohoku UniversityNd-Fe-B ⣔↝⤖☢▼ࡢಖ☢ຊࢆỴᐃ࡙ࡅ࡚࠸ࡿ⤖ᬗ⢏⏺㏆ഐࡢ☢ᛶࢆ᫂ࡽ࠿࡟ࡍࡿࡓࡵࠊ㉸㧗┿✵ୗ࡛◚᩿ࡋࡓ Nd-Fe-B-Cu ☢▼᩿㠃࡟㟢ฟࡋࡓ⢏⏺≀㉁࡟ࡘ࠸࡚㌾ X ⥺ඹ㬆྾཰ࡢ☢Ẽ෇஧Ⰽᛶࢆ⏝࠸࡚ Fe ࡜ Nd ࡢ☢໬㐣⛬ࢆ 21T ࢆ㉸࠼ࡿࣃࣝࢫᙉ☢⏺ୗ࡟࠾࠸࡚ ᐃࡍࡿࡇ࡜࡟ᡂຌࡋ
ࡓࠋ࢖࢜ࣥࢫࣃࢵࢱ࡟ࡼࡾ 2 ⢏Ꮚ⢏⏺࡟೫ᯒࡋࡓ Cu ࢆྵࡴᒙࢆ㝖ཤ࡛ࡁࡿࡇ࡜ࢆ☜ㄆࡋࠊ☢໬ᅔ㞴᪉ྥࡢ☢໬᭤⥺࠿ࡽࠊࢫࣃࢵࢱᚋ࡟ࢃࡎ࠿࡞ࡀࡽ⤖ᬗ☢Ẽ␗᪉ᛶࡀపୗࡋࡓᡂศࡀ⌧ࢀࡿࡇ࡜ࢆぢฟࡋࡓࠋ࣮࣮࢟࣡ࢻ㸸 ☢▼ᮦᩱࠊಖ☢ຊࠊ⢏⏺┦ࠊ⾲㠃ᩄឤ☢Ẽᐃࠊࣃࣝࢫ☢⏺ࠊXMCD⫼ᬒ࡜◊✲┠ⓗ㸸ࣁ࢖ࣈࣜࢵࢻ⮬ື㌴ࡸ㢼ຊⓎ㟁ᶵ➼ࡢ୺せᶵ⬟ᮦᩱࡢࡦ࡜ࡘ࡜ࡋ࡚ᑗ᮶኱㔞࡞㟂せࡀண ࡉࢀࡿ㧗ᛶ⬟ Nd-Dy-Fe-B ⣔↝⤖☢▼ࡀ┤㠃ࡍࡿ Dy ࡢᕷሙ౯᱁ࡢ㧗㦐[1]࡟ᑐฎࡋࠊ㣕㌍ⓗ࡞┬ Dy ໬ᢏ⾡ࢆ㛤Ⓨࡍࡿࡓࡵ࡟ࡣࠊ⌧≧࡛ࡣ␗᪉ᛶ☢⏺ࡢ 20%࡟‶ࡓ࡞࠸ಖ☢ຊࡢపୗせᅉࢆ᫂☜࡟ࡋࠊ␗᪉ᛶ☢⏺ቑᙉࡢࡓࡵ࡟ῧຍࡉࢀࡿ Dy ࡢ౑⏝ࢆᢚไࡍࡿᢏ⾡㛤Ⓨࡀᚲせ࡛࠶ࡿࠋ↝⤖ Nd-Fe-B⣔☢▼ࡢಖ☢ຊⓎ⌧ᶵᵓࡣᮏ⣔☢▼ᮦᩱࡢ㯪᫂ᮇ࠿ࡽ୍㈏ࡋ࡚㠀☢ᛶࡢ Nd ࣜࢵࢳ⢏⏺┦ࡀ୺┦
Nd2Fe14B ࡢ⤖ᬗ⢏ࢆ⭷≧࡟そ࠸ᑾࡃࡋ࡚୺┦⤖ᬗ⢏㛫ࡢ☢Ẽ⤖ྜࢆ㐽᩿ࡋࠊྛ⤖ᬗ⢏⾲㠃㏆ഐࡢ⤖ᬗ☢Ẽ␗᪉ᛶࡀపୗࡋࡓ⾲㠃Ḟ㝗ᒙ࡟࠾ࡅࡿ㏫☢༊᰾ࡢ⏕ᡂ☢⏺ࡀಖ☢ຊࡢ኱ࡁࡉࢆỴᐃ࡙ࡅ࡚࠸ࡿ࡜⪃࠼ࡽࢀ࡚ࡁࡓ[2]ࠋ
࡜ࡇࢁࡀ᭱㏆ Li ࡽࡀ࢔ࢺ࣒ࣉ࣮ࣟࣈศᯒ࡟ࡼࡿ↝⤖ Nd-Fe-B ⣔☢▼ᮦᩱ࡟࠾ࡅࡿ⤖ᬗ⢏⏺┦ࡢ⤌ᡂศᯒ࡟ᡂຌࡋ[3, 4]ࠊ⢏⏺┦ࡣ Fe ࠾ࡼࡧ Co ࢆྜィ 70%⛬ᗘྵ᭷ࡍࡿࡇ࡜࠿ࡽᙉ☢ᛶ≀㉁࡛࠶
ࡿ࠿ࡶ▱ࢀ࡞࠸࡜࠸࠺ྍ⬟ᛶࡀ♧ࡉࢀࡓࠋࡶࡋࡶࡑ࠺࡛࠶ࡿ࡞ࡽࠊNd-Fe-B ↝⤖☢▼ࡢಖ☢ຊⓎ⌧ᶵᵓ࡟㛵ࡍࡿ⪃࠼᪉ࢆ᰿ᗏ࠿ࡽぢ┤ࡍᚲせࡀ࠶ࡾࠊ㧗ಖ☢ຊ໬࡬ࡢ࢔ࣉ࣮ࣟࢳ࡟ࡶᙜ↛኱ࡁ࡞ኚ᭦ࡀᚲせ࡜࡞ࡿࠋࡑࡇ࡛ࠊᮏ◊✲࡛ࡣಖ☢ຊࢆỴᐃ࡙ࡅ࡚࠸ࡿ⤖ᬗ⢏⏺㏆ഐࡢ☢ᛶࢆ᫂ࡽ࠿࡟
ࡍࡿࡇ࡜ࢆ┠ᶆ࡟ࠊ⢏⏺◚᩿ࡀඃඛⓗ࡟㉳ࡇࡿ Nd-Fe-B ⣔↝⤖☢▼ࡢᛶ㉁ࢆ฼⏝ࡋ࡚◚᩿㠃࡟⢏⏺≀㉁ࢆ㟢ฟࡉࡏࠊ᳨ฟ῝ᗘࡀᩘ nm ࡜࠸࠺㌾ X ⥺ඹ㬆྾཰ࡢ☢Ẽ෇஧Ⰽᛶ㻔MCD㻕ࢆ฼⏝ࡍࡿ᳨ウࢆ 2010B ᮇ࡟㛤ጞ[5]ࡋࠊ2011A ᮇࡢㄢ㢟࡜ࡋ࡚௨ୗࡢ 2 㡯┠ࢆタᐃࡋ࡚㉸㧗┿✵ ᐃࢳࣕࣥࣂෆ࡛◚᩿ࡋࡓ Nd-Fe-B ⣔ヨᩱ࡟ᑐࡋ࡚ ᐃࢆ㐙⾜ࡋࡓࠋ 㻔1㻕 ⢏⏺࡟೫ᯒࡍࡿࡇ࡜ࡀ᫂ࡽ࠿࡟ࡉࢀ࡚࠸ࡿ[3, 4]Cu ࡢ㌾ X ⥺ MCD ᙉᗘࢆᣦᶆ࡜ࡋࡓࢿ࢜ࣥ࢖࢜ࣥࢫࣃࢵࢱ࡟ࡼࡿ⢏⏺≀㉁ᒙ࡜☢▼ẕ┦≀㉁࡜ࡢ㆑ู
 㻔2㻕 ☢໬ᐜ᫆᪉ྥ࡟㓄ྥᡂᙧࡋࡓ☢▼ヨᩱ࡟ࡘ࠸࡚ࡢࠊࣃࣝࢫ㧗☢⏺ࢆ⏝࠸ࡓ☢໬ᅔ㞴᪉ྥࡢ㌾X ⥺ MCD ࡟ࡼࡿඖ⣲㑅ᢥⓗ☢໬᭤⥺ ᐃࠊ࠾ࡼࡧ ᐃ⤖ᯝ࡟ᇶ࡙ࡃ⢏⏺㏆ഐ≀㉁ࡢ☢ᛶࠊ≉࡟␗᪉ᛶ☢⏺ࡢホ౯ᐇ㦂㸸
0.1 ཎ Ꮚ ࣃ ࣮ ࢭ ࣥ ࢺ ࡢ Cu ࢆ ྵ ࡴ Nd-Fe-B ⣔ ␗ ᪉ ᛶ ↝ ⤖ ☢ ▼ ヨ ᩱ ࢆ స 〇 ࡋ ࠊ ࠾ ࡼ ࡑ
2mm×2mm×15mm ࡢ㛗ᡭࡀ☢໬ᐜ᫆᪉ྥࡢࡶࡢ࡜☢໬ᅔ㞴᪉ྥࡢ 2 ✀㢮ࡢᲬ≧ヨᩱࢆ‽ഛࡋࡓࠋࡇࢀࡽࡢヨᩱࢆ BL25SU ࡟タ⨨ࡋࡓ㉸㧗┿✵⎔ቃ࡟࠶ࡿ ᐃࢳࣕࣥࣂෆ࡛◚᩿ࡋࠊᲬ≧ヨᩱࡢ㛗ᡭ᪉ྥ࡟ᖹ⾜࡟ X ⥺ࢆධᑕࡋ࡚ XAS㻔X-ray absorption spectroscopy㻕 ᐃࢆ Cu, Fe, Nd ࡟ࡘ࠸࡚ࠊMCD ᐃࢆ Fe ࠾ࡼࡧ Nd ࡟ࡘ࠸࡚඲㟁Ꮚ཰㔞ἲ࡟ࡼࡾ⾜ࡗࡓ㸦඲࡚ᐊ 㸧ࠋ◚᩿㠃࡟Ꮡᅾࡍࡿ⢏⏺≀㉁ࡢ XMCD ࡟ᑐࡍࡿᐤ୚ࢆẁ㝵ⓗ࡟ኚ໬ࡉࡏࡿ┠ⓗ࡛ࢿ࢜ࣥ࢞ࢫᅽຊ 3 × 10-3 Pa, ຍ㏿㟁ᅽ
0.3 kV ࡛࢖࢜ࣥࢫࣃࢵࢱ࡟ࡼࡿ⾲㠃㝖ཤ࡜ Cu ࡢ྾཰ᙉᗘ ᐃ࡜ࢆ⧞ࡾ㏉ࡋ⾜࠸ࠊ⢏⏺ᒙ㝖ཤ࡟ᚲせ࡞ࢫࣃࢵࢱ᫬㛫ࢆ๭ࡾฟࡋࡓᚋࠊูヨᩱࢆ⏝࠸࡚ࢫࣃࢵࢱ๓ᚋࡢ MCD ࢆ ᐃࡋࡓࠋࣃࣝࢫᙉ☢ሙ XMCD ⿦⨨ࢆ౑⏝ࡋ࡚᭱኱ 21.3T ࡢ㧗☢⏺ࢆⓎ⏕ࡉࡏࠊ☢໬ᐜ᫆᪉ྥ࡜☢໬ᅔ㞴᪉ྥ࡟ࡘ࠸࡚ MCD ࡟ࡼࡿ☢໬᭤⥺ࡢ ᐃࢆ⾜ࡗࡓࠋ⤖ᯝ࠾ࡼࡧ⪃ᐹ㸸
ᅗ 1 ࡟☢໬ᐜ᫆᪉ྥ ↓╔☢ ࡟࠾ࡅࡿ 924eV ࠿ࡽ 942eV ࡢ XAS ࡢࢫࣃࢵࢱ᫬㛫౫Ꮡᛶࢆ♧ࡍࠋ
Pr6O11ࠊCuO ࡞࡝ࡢཧ↷≀㉁࡟࠾ࡅࡿ XAS ࡜ࡢẚ㍑࠿ࡽࠊ929.36eV ࡢࣆ࣮ࢡࡣཎᩱ୰ࡢ୙⣧≀Pr ࡢ M5 ඹ㬆྾཰ࠊ933.26eV ࡢࣆ࣮ࢡࡀ Cu L3 ྾཰࡟ᑐᛂࡍࡿ࡜⪃࠼ࡽࢀࡿࠋࢫࣃࢵࢱ᫬㛫࡜࡜ࡶ࡟ Cu ࡢ྾཰ᙉᗘࡀῶᑡࡋ࡚࠾ࡾࠊࢫࣃࢵࢱ࡟ࡼࡾ⢏⏺ᒙཌࡀῶᑡࡍࡿ࡜࠸࠺ண ࡜୍⮴ࡍࡿࠋCu ࡢ L3 ྾཰ᙉᗘࡣࢫࣃࢵࢱ᫬㛫 40 ศࡲ࡛ࡣᛴ㏿࡟ῶᑡࡍࡿࡀࠊࡑࢀ௨㝆ࡣῶᑡࡢ㏿ᗘࡀ⦆ࡸ࠿
࡟࡞ࡿࡇ࡜࠿ࡽࠊ⣙ 30 ศࡢࢫࣃࢵࢱ࡛ 2 ⢏Ꮚ⢏⏺㒊ศࡢ⢏⏺ᒙࡀ࡯ࡰ㝖ཤ࡛ࡁࠊ࠿ࡘࠊ୺┦⢏⾲㠃࡬ࡢࢫࣃࢵࢱࣜࣥࢢࡢᙳ㡪ࢆ㑊ࡅࡿࡇ࡜ࡀ࡛ࡁࡿ࡜ุ᩿ࡋࡓࠋࡓࡔࡋࠊࡇࡢ᫬Ⅼ௨㝆ࡶ⢏⏺ 3㔜Ⅼࡢ m ࢧ࢖ࢬࡢ Nd ࣜࢵࢳ┦࡟ྵࡲࢀࡿ Cu ࡢᐤ୚ࡀṧᏑࡋ࡚࠸ࡿ࡜⪃࠼ࡽࢀࡿࠋࡲࡓࠊཧ↷≀㉁㻔NdCu㻕࡟࠾ࡅࡿ XAS ࡜ẚ㍑ࡍࡿࡇ࡜࡟ࡼࡾࠊ⢏⏺ᒙ࡟೫ᯒࡋࡓ Cu ࡢ XAS ឤᗘ῝ࡉෆࡢᖹᆒ⃰ᗘࡣ㓄ྜ㔞ࡢ 10 ಸ㏆ࡃ࡟⃰⦰ࡉࢀ࡚࠸ࡿ࡜ぢ✚ࡶࡽࢀࡓࠋ
ᅗ 1Cu-L3 ྾཰➃㏆ഐࡢ XAS ࣆ࣮ࢡࡢࢫࣃࢵࢱ᫬㛫౫Ꮡᛶ ᅗ 2 ࡟☢໬ᐜ᫆᪉ྥ࠾ࡼࡧ☢໬ᅔ㞴᪉ྥ࡟࠾ࡅࡿ Fe-L3 ྾཰➃࡜ Nd-M3 ྾཰➃ࡢ XMCD ࡟ࡼࡿ☢໬᭤⥺ࢆࢫࣃࢵࢱ๓㻔as-fractured㻕࡜ 30 ศࢫࣃࢵࢱᚋ㻔30min. sputtered㻕࡟ࡘ࠸࡚ẚ㍑ࡋ࡚♧ࡍࠋࣃࣝࢫ☢⏺ࡢ❧ࡕୖࡀࡾ㏿ᗘ࡜ῶᑡ㏿ᗘࡀ኱ᖜ࡟␗࡞ࡿࡀࠊᮏᅗ࡛ࡣࢹ࣮ࢱࢆ 0.25T ࡈ࡜࡟ᖹᆒ໬ฎ⌮ࡋ࡚♧ࡋࡓࠋࢫࣃࢵࢱ๓ࡣᅔ㞴᪉ྥࡢ☢໬᭤⥺ࡀ⣙ 8T ࡛㣬࿴ࡋࠊᐊ ࡛ࡢ Nd2Fe14B ໬ྜ≀ࡢ␗᪉ᛶ☢⏺࡜୍⮴ࡍࡿࠋFe ࡟ࡘ࠸࡚ࡣࠊࢫࣃࢵࢱᚋࡣᅔ㞴᪉ྥࡢ☢໬᭤⥺ࡢ㣬࿴್ࡣࢫࣃࢵࢱ๓࡜࡯ࡰ୍⮴ࡋࠊ3T ࡲ࡛ࡢప☢⏺࡛ࡢ☢໬ࡢ❧ࡕୖࡀࡾࡀࢫࣃࢵࢱ๓ࡼࡾࡶ኱ࡁࡃ࡞ࡾࠊ☢໬᭤⥺ࡀ⭾ࡽࢇ࡛࠸ࡿࠋࡇࡢࡇ࡜࠿ࡽࠊࢫࣃࢵࢱࢆ᪋ࡍࡇ࡜࡟ࡼࡾࠊ☢Ẽⓗ࡟㌾໬ࡋࡓ┦ࡲࡓࡣ㡿ᇦࡀ⏕ᡂࡋࡓࡇ࡜ࡀ♧၀ࡉࢀࡿࠋࢫࣃࢵࢱᚋࡢ☢໬᭤⥺ࡣ MCD ᙉᗘࡢ⤯ᑐ್ࡀ☢໬ᐜ᫆᪉ྥ࡜ᅔ㞴᪉ྥ୍࡛⮴ࡋ࡞࠸࡜࠸࠺୙⮬↛࡞Ⅼࡀ࠶ࡿࡀࠊཎᅉࡣࡲࡔศ࠿ࡗ࡚࠸࡞࠸ࠋࡲࡓࠊNd ࡢ☢໬᭤⥺ࡔࡅࡀ㧗☢⏺ᖏ☢⋡ࡀ㠀ᖖ࡟኱ࡁ࠸࡜࠸࠺⯆࿡῝࠸≉ᚩࢆ♧ࡍࡇ࡜ࡀศ࠿ࡗࡓࠋᅗ 2 ☢໬ᐜ᫆᪉ྥ㻔easy㻕࡜ᅔ㞴᪉ྥ㻔hard㻕ࡢ Fe ࡜ Nd ࡢ XMCD ☢໬࣮࢝ࣈ௒ᅇࡢᐇ㦂࡛ࡣࠊ┿✵◚᩿≧ែ࡛◚᩿㠃࡟㟢ฟࡋࡓ࡜⪃࠼ࡽࢀࡿ Nd ࡟ᐩࡳ Cu ࡀ㓄ྜ⃰ᗘࡢ⣙10 ಸ࡟⃰໬ࡋࡓ⢏⏺≀㉁ࡢ☢ᛶࢆホ౯ࡍࡿࡇ࡜ࢆヨࡳࡓࡀࠊࡑࡢ☢Ẽ␗᪉ᛶ☢⏺ࡀ Nd2Fe14B ࡢࣂࣝࢡయ࡟ᑐࡋ࡚ሗ࿌ࡉࢀ࡚࠸ࡿ್࡜࡯ࡰ୍⮴ࡋࡓࡇ࡜࠿ࡽࠊ ᐃ⤖ᯝ࡟ᑐࡋ࡚ḟࡢ஧ࡘࡢྍ⬟ᛶࡀ⪃࠼ࡽࢀࡿࠋࡍ࡞ࢃࡕࠊ
㻔1㻕 ⢏⏺≀㉁ࡣ୺┦࡜࡯ࡰྠࡌ☢ᛶࢆ♧ࡍࠋࡲࡓࡣࠊ㻔2㻕 ⢏⏺≀㉁ࡣᖖ☢ᛶ࡛ MCD ࡟ࡼࡾ ᐃࡉࢀࡓ☢໬᭤⥺ࡣ 1nm ⛬ᗘࡢⷧࡉࡢ⢏⏺≀㉁࡛そࢃࢀࡓ୺┦⾲ᒙ㒊ࡢ☢໬᭤⥺࡟ᑐᛂࡍࡿࠋ
ࡲࡓࠊ◚᩿㠃ࢆࢿ࢜ࣥ࢖࢜ࣥ࡟ࡼࡿࢫࣃࢵࢱࣜࣥࢢ࡛㝖ཤࡋࡓᚋ࡟ᅔ㞴㍈ࡢ☢໬᭤⥺ࡀഹ࠿࡞ࡀࡽ☢Ẽⓗ࡟㌾໬ࡋࡓᡂศࢆ♧ࡋࡓࡇ࡜࠿ࡽࠊḟࡢ㸱ࡘࡢྍ⬟ᛶࡀ⪃࠼ࡽࢀࡿࠋࡍ࡞ࢃࡕࠊ
㻔i㻕 ୺┦⾲ᒙ㒊ࡢ␗᪉ᛶ☢⏺ࡀ⢏⏺≀㉁ࡢ㝖ཤ࡟ࡼࡾపୗࡋࡓࠋ
㻔ii㻕 ⢏⏺≀㉁ࡀ㝖ཤࡉࢀࡓᚋ࡟ࢫࣃࢵࢱࣜࣥࢢ࡟ࡼࡾ୺┦⾲ᒙ㒊ࡢ␗᪉ᛶ☢⏺ࡀపୗࡋࡓࠋ
㻔iii㻕 ⢏⏺≀㉁࠿ࡽࡢ Nd ࡸ Cu ࡢ㑅ᢥⓗࢫࣃࢵࢱࣜࣥࢢࡢ⤖ᯝࠊࣇ࣮ࣜࡢ Fe ࡀ⏕ᡂࡋప☢໬࣭ప☢Ẽ␗᪉ᛶࡢ≀㉁࡜ࡋ࡚⾲㠃࡟ሁ✚ࡋࡓࠋࡓࡔࡋࠊ㻔ii㻕࡟ࡘ࠸࡚ࡣࢫࣃࢵࢱࣜࣥࢢ᫬㛫ࢆࡇࡢࡼ࠺࡞ࡇ࡜ࡀ㉳ࡇࡾ࡟ࡃ࠸ࡼ࠺࡟タᐃࡋࡓࡢ࡛ࠊྍ⬟ᛶࡣప࠸࡜⪃࠼࡚࠸ࡿࠋࡲࡓࠊNd ࡢ㧗☢⏺ᖏ☢⋡ࡀ␗ᖖ࡟኱ࡁ࠸ཎᅉ࡟ࡘ࠸࡚ࡣࠊ
㻔a㻕 ⾲ᒙ௜㏆ࡔࡅ Nd ࡟ാࡃศᏊ☢⏺ࡀ኱ࡁࡃపୗࡋ࡚࠸ࡿ㻔100T ௨ୗ㻕䚹㻔b㻕 ⾲ᒙ௜㏆ࡔࡅ Nd ࡢ☢Ẽ࣮࣓ࣔࣥࢺࡀࢥࣜࢽ࢔࡞㓄⨨࠿ࡽࡎࢀ࡚࠸ࡿࠋ࡞࡝ࡢྍ⬟ᛶࡀ⪃࠼ࡽࢀࡿࠋ
ୖグࡢ」ᩘࡢྍ⬟ᛶ࡟ࡘ࠸࡚ࡣࢫࣃࢵࢱࣜࣥࢢࡀᮦᩱ࡟୚࠼ࡿᙳ㡪ࢆࡉࡽ࡟ៅ㔜࡟ุ᩿ࡍࡿࡓࡵࡢᐇ㦂ࡀᚲせ࡛࠶ࡾࠊ⌧ᅾࠊࡑࡢᐇ᪋ࢆ᳨ウࡋ࡚࠸ࡿࠋࡲࡓࠊࡇࡢⅬ࡟㛵ࡋ࡚ࠊ☢໬ᐜ᫆᪉ྥ
ࡢ Nd ࡜ Cu ࡢ྾཰ᙉᗘࡀ␗ᖖ࡟పࡃ࡞ࡗ࡚࠸ࡿ࡜࠸࠺ ᐃ⤖ᯝࡀᚓࡽࢀ࡚࠾ࡾࠊヨᩱࡢṧ␃☢໬ࡀࢫࣃࢵࢱࣜࣥࢢຠ⋡࡟୚࠼ࡿຠᯝࡢᏑᅾࢆ♧၀ࡋ࡚࠸ࡿࠋ
௒ᚋࡢㄢ㢟㸸
㌾ X ⥺ MCD ࢆ⏝࠸࡚ࣁ࣮ࢻ☢ᛶᮦᩱࡢ☢໬ᅔ㞴᪉ྥࡢ☢໬᭤⥺ࢆ␗᪉ᛶ☢⏺ࡢᩘಸ࡟ᙜࡓࡿ
21.3T ࡢ㧗☢⏺ࡲ࡛ ᐃࡍࡿࡇ࡜࡟ᡂຌࡋࡓࠋࡇࢀࡣୡ⏺ึࡢᡂᯝ࡜ᛮࢃࢀࡿࠋ⢏⏺◚᩿ࡀඃඛⓗ◚᩿ᶵᵓ࡛࠶ࡿ Nd-Fe-B ⣔↝⤖☢▼ヨᩱࡢ◚᩿㠃࡟ṧ␃ࡋࡓ⢏⏺≀㉁ࢆࢿ࢜ࣥ࢖࢜ࣥࢫࣃࢵࢱ࡟
ࡼࡾ㝖ཤࡍࡿ࡜୺┦⾲ᒙ㒊࡟☢Ẽⓗ࡟㌾໬ࡋࡓᡂศࡀ⏕ᡂࡍࡿࡇ࡜ࡀ♧၀ࡉࢀࡓࠋࡇࡢ⌧㇟࡟㛵ࡍࡿࢫࣃࢵࢱࣜࣥࢢࡢຠᯝࢆุ᩿ࡍࡿࡓࡵࡢᐇ㦂ࡀ௒ᚋᚲせ࡜⪃࠼ࡽࢀࡿࠋ

ཧ⪃ᩥ⊩㸸
[1] ౛࠼ࡤ Metal Research Bureau; http://mrb.ne.jp/index.html[2] ౛࠼ࡤ M. Sagawa, S. Hirosawa, H. Yamamoto, S. Fujimura, Y. Matsuura, Jpn. J. Appl. Phys. 26, 785
㻔1987㻕.
[3] W. F. Li, T. Ohkubo, T. Akiya, H. Kato, K. Hono, J. Mater. Res. 24, 413 㻔2009㻕.
[4] W. F. Li, H. Sepehri-Amin, T. Ohkubo, N. Hase, K. Hono, Acta Mater. 59, 3061 㻔2011㻕.
[5] 2010B1783 ฼⏝ሗ࿌᭩.