TWI284330B - Magnetic nanomaterials and synthesis method - Google Patents
Magnetic nanomaterials and synthesis method Download PDFInfo
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- TWI284330B TWI284330B TW092103669A TW92103669A TWI284330B TW I284330 B TWI284330 B TW I284330B TW 092103669 A TW092103669 A TW 092103669A TW 92103669 A TW92103669 A TW 92103669A TW I284330 B TWI284330 B TW I284330B
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Description
1284330 (Ο 玟、發明說明_ 技術領月域钦月發明所屬之技術領域、先前技術、内容、實施方式及圖式簡單說明) '本發明大致有關磁性奈米粒子與合成磁性奈米粒子之方 :。更明確地說’本發明有關在有機金屬先質 =之鐵磁性奈米粒子,其用於例如高密度資訊貯存媒、 又“曰曰片上讯號隔離、感應器等,以改善高頻積 體電路應用中之被動組件性能。 、、 先前技術 者在:::?電路應用,諸如用於無線可攜式電子裝置中 ,可以::、功能度更大、性能更強以及較低之成本 路了中=將被動組件(諸如感應器與變壓器)整合於積體電 電子^此导目的°積體電路中未整合被動組件係造成 ,糸統中被動與主動組件比高至脈!的因素。不過 =的被動組件與積體電路上之主動元件整合時,會消 :::石夕,使其整合經常無經濟效益。因此,已發展出 。夕、方去減少被動組件用掉積體電路上之空間。 料③在積體η中面積的途徑之-係透過磁性材 ::二Γ如渗透性大於-之材料。此途徑之目的係利用 = 材^電磁能量貯存能量提高,來提高每單位面 貝 < 弘感。伴隨之感應器 低寄生電衮…η“ 降低串聯電阻與降 同材# 11 1 σ ,此(更高Q係數)。在變壓器中’相 以提高嶋數,因此提高《器中之』 面積較小,因此可以提:裝置 =:該:性材料内使其 门衣罝封衣松度。達到此等被動裝 1284330
置改良的傳❹法係使用非晶相或結晶固態相磁性材料 ,諸如例如EP〇716433中所揭示者。不過,在高頻應用時: 例如高MHz或低GHz頻率下,因為渦流損失與損失產生之 鐵磁性共振(FMR)使諸如此種方法之方法有其性能限制。 克服此等伴隨缺點之嘗試會使磁性奈米粒子(即,奈米 尺寸之粒子)空間分離以及電絕緣,如使該材料在裝置操 作溫度時呈鐵磁性,而且其係由單一磁域組成為佳。由於 可以抑制渦流損失以及將該FMR衰減擴大至更高頻率,該 磁性奈米粒子得以提高MHz-GHz‘圍中之單位面積電感 密度。不過,重要的是該複合磁性奈米粒子材料具有某些 性質,諸如磁性滲透性(μ)(即大於丨(一)),以及對應損失 (μ”)使得例如重要之MHz-GHz頻率範圍内的(滲透性)/(損 失)大於5。 已嘗試數種方法,以製造具有此等品質其中某些部分的 奈米粒子’此等方法通常分成三類:物理方法、樣板方法 與化學方法。 物理方法係諸如丨賤錢與蟲晶法(分別詳見Y.Μ· Kim等人 之 IEEE Trans, on Magn. vol. 37, no. 4, 2001 與 m_ Dumm 等 人之 Journal of Applied Physics vol.87, ηο·9, 2000)製造薄層 。不過’這兩種方法產生高摩透性膜最高僅約500 MHz, 而且通常不大於2-3微米,以使渦流損失最小。不過,此種 性能不足以加強被動裝置所需之有效磁場吸持。 樣板方法係諸如 Cao, H.,Xu,Z·,Sang,H·,Sheng,D·,Tie, C· Adv· Mater· 2001,vol. 13· p. 121 所述之方法,通常為無 (3) (3)1284330 發曰ϋ說明續頁 機或微蚀刻有機基質溝内之電化學性奈米棒或奈米線。此 種^法的主要缺耗粒子形成之後,該有_無機基質會 毀壞’其中該粒子形成作用會產生副產物,該副產物通常 會干擾該奈米粒子。如此導致飽和磁化作用比整塊金屬之 飽和磁化作用降低,而且亦避免形成高密度材料。 化學方法諸如Sun,S· Murray之c B^办〆户咖1999, ν〇1· 85, P. 4325 或是 Alivisat〇s,p· puntes,ν ρ Krishnan,κ M. Appl’ Phys. Lett. 2001,ν〇1· 78, ρ·2187所述之化學減少 或分解一種羰基先質等係有關在溶液中合成奈米粒子。該 化學方法,更明確地說,Sun等人之方法可以由高密度記錄 用之羰基鈷先質製造自組單分散球形鈷粒子。不過,由於 其尺寸小,室溫下該粒子仍然保持超順磁性,因此不會產 生高滲透性材料所達到之所需磁場吸持。其他著作係用相 同作者揭示於Sun, S. Murray,C· B· Weller,D· Folks,L· Moseir,A. Science 2000, ν〇1· 287, ρ·1989,其產生鐵鉑 (Fe/Pt)粒子以加強邊材料之磁性各向異性。不過,與上述 相似’該材料中的粒子尺寸小使其呈超順磁性,因而不適 用於磁% 吸持。在puntes,v. F. Krishnan,K. M. Alivisatos, Α· Ρ· Science 2001,v〇l. 291,ρ·2115 中,使用油酸與氧化三 辛基料(TOPO) ’由魏基錄先質製造姑奈来棒。不過,其需 要例如約300°c之高溫處理。此外,以此種方式製得之奈米 棒热熱力安定性’而且通常在反應的前幾秒内自動重配置 成球形奈米粒子。近來亦有報告提出鐵與鎳奈米棒,其係 於存在配位體,諸如TOPO與十基烧胺(HDA)下,分別分解 1284330
Fe(CO)5(Park, Kim9 S.; Lee, S.;Khim5 Z.G.; Char, K.;
Hyeon,T. J. Am· Chem· s〇c 2〇〇〇, v〇1 122, p 85川與 Ni(COD)2(N. Cordente, C.Amiens,F Sen〇cq,M __以 及 B. Chaudret,Nano Letters 2001,i⑽,p.565)。兩種材料 均非單相(粒子不會顯示相同形狀)。此外,此等粒子於室溫 下呈超順磁性,因此不適於磁場吸持。 所以,而要一種由磁性奈米粒子所組成之磁性材料,其 於室溫及/或最高達例如約105力之操作溫度下呈鐵磁性’,、 而且具有單一尺寸、形狀與磁性定向。此外,需要一種製 造此等可以調整縱橫比之具有熱力安定性磁性奈米粒子$ =法’該奈米粒子係封裝在一種非磁性基質内,如此此等 取終磁性奈米粒子材料可以用於高頻積體電路應用,諸如 用於無線可攜式電子裝置,以加強在各種被動與主動裝置 中之磁場吸持。 發明内容 根據本發明,申請專利範圍第1項中提出-種磁性奈米粒 子,申請專利範圍第12項中主張—種磁性奈求材料,而申 請專利範圍第14項中主張合成磁性奈米粒子之方法。 實施方式 在高頻積體電路應用巾,諸如用於無線可携式電子裝置 ’可以經由與磁性奈米粒子材料整合,改善諸如感應器盥 變壓器等被動組件以及用於訊號隔離之結構。本發明實例 之特;係使用複合材料’該材料包括包含特定體 積部分之磁性奈米粒子的基質材料,該磁性奈米粒子具有 1284330
飽矛(Ms)與各向異性(Hk),其中這三者(體積部分、Ms與^^) 最佳化,如此使該複合材料,具有足夠高滲透性與足夠高 頰之鐵磁性共振,得以改善高%1^與0]9^頻率下之被動 裝置(諸如感應器、變壓器、隔離)。可以經由改變該奈米粒 子之化學組成使飽和磁化作用(Ms)最佳化。可以經由該結 晶結構、該奈来粒子與複合材料本身之形狀最佳化各向異 此外為了充分利用複合磁性奈米粒子材料之電場吸 持性貝,該粒子之各向異性軸必須全部彼此對準。符合此 一2求之代表性途徑係先提高該材料的整體各向異性,可 以糟由改善該粒子形狀達到此㈣。形成更需要之形狀, 諸如長形粒子(橢圓形、棒狀、線狀或其他矩形、非球形粒 子)代#幵/成奈米球體。在匕等粒子必帛大到I以在最大裝置 操作溫度(例如,105t)下呈鐵磁性,但是小到足以由單一 磁域(或僅由數磁域)所組成為佳,即,其尺寸直徑與長度二 者必須在2至30 nm之譜。然後,該奈米粒子具有自組性, 而且經由一種配位體外殼或其他絕緣層工具,諸如原有之 氧化物外殼、氧化石夕塗層或其他絕緣塗層,使之彼此電絕 緣。不過’理想狀態係’包含該奈米粒子之材料必須具有 高度抗性,作為該奈米粒子之抗氧化劑,而且在至少高達 例如約15 0 c之溫度時仍然具有化學安定性。 圖1顯示本發明實例製備磁性奈米粒子之方法10。該方法 係由12開始,將14之溶液A添加於羧酸中,以油酸等為佳, 其中溶液A包括-種溶劑,以驗或芳族溶劑為佳,諸如甲笨 、甲氧基苯、二辛基驗等。然後,將一種胺(以油婦基胺等 Ί2- 1284330 ⑹ 輕)添加於該溶劑與油酸溶液中,完成溶液a。當然,可 ^ 此處未列出之其他溶劑與胺類進行相同分解作用。 厂驟16包括將溶液八添加於金屬有機先質,諸如姑先質 〇h (^ΗηΧη^^Η^),形成溶液B。可使用其他金屬先質 ’諸如烴金屬複合物,諸如叫以也減叫⑽士等等 、:亦可以任何順序添加溶液之組份,並混合在—起,形成 洛液Β。於步驟18,例如在壓力為例如3巴Η2之下,藉由在 甲氧基苯中以約15代轄射加熱溶液Β約48小時。此實例中 ’在步驟18處理期間,球形單分散鈷奈米粒子結合成奈米 才午之句勻幵v狀’不過,反應約1〇小時之後,此實例的溶液 中開始顯現奈米棒。該奈米棒係封閉式六邊形㈣)晶體, 而且沿者該結構之生長。完成f要數小時之反應後,該 奈米棒呈#之熱力安定形式。㈣熱力安定料轉不會 重配置其他形^,諸如球形奈求粒子或任何其他形式。 本方法之高產率合成作用(例如在奈米棒中發現接近7〇% 最初導入該溶液中之鈷)係於奈米棒中發現,其係於步驟2〇 中、於空乳女定之奈米棒上,沿著相同軸例如,。軸對準, 而且具有均勻直徑尺寸,如圖2與3所示。 圖2顯示本發明實例形成磁性奈❹料之磁性奈米粒子 之組合體30的高解析度透射電子顯微相片(hrtem),並中 沿著c軸生長對準。圖2亦顯示該奈轉在二維晶格中自組 ’該奈米棒間具有真正的矩形空間。在比圖2低之磁化作用 下,圖3顯示出高密度或高體積部分(例如,磁性奈米棒之 體積部分大於30%)、生長方向沿^轴之自組⑽米棒。 -13- 1284330 |圓_ 該實例所形成之奈米粒子顯示出磁性性質,諸如例如·· ·)飽#磁化作用與整塊録之磁性特徵以及性質相似;ii)因形 狀各向異性’加強磁性各向異性以及大大強化矯頑磁場(與 整塊鈷與球形奈米粒子相較)。此處之矯頑磁場主要由形^ 各向/、II所决疋。例如,在直徑4·9 之球形奈米粒子中 、磁f生各向異性He = 800高士,但是以油烯基胺與油酸作 為安疋劑所製得之奈米棒He = 89〇〇高士;以及出)於室溫 (或以上)具有鐵磁性,同時仍然保持單一磁域。 圖4與5顯示本發明實例之鈷奈米粒子的磁性性質。圖*顯 不,在10高士固定弱磁場下,當溫度提高至2〖至3〇〇 κ,然 後自300K降至2K時,該磁性奈米粒子之磁化作用評估。 圖5本發明實例在另一組條件下的另一組結果,其中飽和 磁化作用(Ms)=160電磁單位(EMU)/gC〇 ,殘餘磁化作用 (MR) - 80 EMU/gCo ’矯頑磁場之各向異性(士)= 89〇〇高士 ,而磁矩(μ)=1,69μΒ。圖5顯示該磁性鈷奈米粒子於室溫 下之磁滯迴線(以磁化作用作為所施加磁場之函數)。該溫度 保持在300Κ,並將磁化作用記錄為所施加磁場之函數If二 至5Τ,前至-5Τ後至+5 丁,因此封密所施加之磁場週期ρ 在150°C甲氧基苯中,於例如48小時内可以達到步驟18 之有機金屬先質的分解作用,並且提供高產率,例如為组 織化奈米材料中約7〇%,本實例中該奈米材料係由尺寸為 例如直徑約9 nm ’長度為50-1〇〇 nm之個別奈米棒所组成, 如通2與3所示。將會明白,藉由修正胺/酸比,可以改變該 奈米材料之各向異性。圖6顯示本發明實例之熱力安定磁性 -14- 1284330
奈米粒子22之示意圖。該磁性核心24、24於室溫/操作溫度 下呈鐵磁性,而非磁性封裝材料26、36封裝該磁性核心, 其該磁性奈米粒子電絕緣,而且避免受到環境污染。該磁 性奈米粒子可能具有預定可調整縱橫比,如此可以根據該 胺/酸比修正直徑28、3 8與長度29、39。例如,可以修改胺 /酸比,製得具有不同尺寸與不同縱橫比[]l/d (29/28)]之奈 米棒,例如該直徑範圍可能自約5 11111至3〇 nm,長度可能自 約10 nm至1 〇〇 nm。因此,實例包括自j當量油酸至2當量油 酉文形成奈米線(約7 nmx600 nm)。同樣地,可以藉由改變胺 鏈長控制该奈米棒縱橫比(長度/寬度),例如丨當量油烯基胺 (8個碳原子)與1當量油酸產生1〇nmxl7nm之奈米棒。其他 實例中,1當量十六烷胺(16個碳原子)與1當量油酸產生6 nmxl25 nm之奈米棒。在另一實例中,使用i當量六八烷胺 (18個碳原子)與1當量油酸產生6nmx45nmi奈米棒。當然 ,可使用其他變數控制該奈米材料之各向異性。此實例中 ,該奈米粒子係單晶,而且顯示整塊鈷之hep結構,因此每 個粒子沿著該hep結構之c軸對準。該奈米粒子間隔距離例 如3 nm,其相當於介於兩個相鄰奈米粒子間之配位體外殼 總寬度。 因此,本實例中,合成之鐵磁性奈米粒子(例如奈米蜂) 包含一配位體外殼,例如油烯基胺與油酸,羧酸/胺或任何 胺或酸等之任何組合物,其具有多重有益影響。例如,該 有機配位體提供以下目的其中_部分:丨)引發奈米粒子之各 向/、f生生長,孩主軸與hCp結晶結構之〇軸一致;丨丨)避免該 -15- 1284330 奈米粒子接觸空氣氧化與發生其他化學反應,諸如形成表 面氫氧化物等等;出)使該奈米粒子在有機溶劑中分散,而、 且不會對於該奈米粒子磁性性質造成不良影響;卜)使夺米 粒子沿著每個奈米粒子結晶各向異性軸自動對準;以ϋ 產生電絕緣粒子’因此限制渴流損失,並避免跨多粒子形 成磁域,如此可以改善高頻表現;以及vi)得以在磁場中進 行粒子定向,使高頻裝置應用最佳化。 當然,將明白本方法可使用其他鐵磁性元素,諸如例如 鐵、鐵等,以及相關合金,諸如例如Feco、NiFeco等,並 且刻意與該粒子一同添加金屬或非金屬雜質,諸如鈕、删 、氧、氮等,以改善預定構造中之磁性材料性質,使其最 適用於特定應用,諸如積體被動組件裝置。 將明白,雖然前文已經說明本發明特定實例,但是熟悉 本技術之人士在不違背本發明範圍下,可以製得各種其他 修正與改良。 圖式之簡單說明 現在茲將參考圖式更詳細說明本發明實例,其中·· 圖1顯示製備本發明實例之磁性奈米粒子的方法; 圖2顯示本發明實例之沿著較佳軸生長排列(例如c軸)之 磁性奈米粒子的南解析度透射電子顯微相片(Hrtem); 圖3顯示本發明實例之高密度自組磁性奈米粒子之透射 電子顯微相片(TEM); 圖4顯示在2與300K間,於約10G之弱磁場下,根據零場 冷卻/場冷卻(ZFC/FC)法測量本發明實例磁化作用之圖,其 -16- 1284330 (10) 中以化學微分析測定之樣本中鈷含量使磁化值標稱化; 圖5顯示本發明實例之磁性奈米粒子在300K磁滯迴線介 於+5與-5T之間,其中以化學微分析測定之樣本中鈷含量使 磁化值標稱化;及 圖6顯示本發明具有可調整縱橫比之熱力安定磁性奈米 粒子的示意圖。
圖式代表符號說明 22 奈歩粒子22 23/24 磁性核心23/24 26/36 封裝材料26/36 28/38 直徑28/38 29/39 長度29/39 30 組合體30 -17-
Claims (1)
- 工284^^益⑽669號專利申請案 申請專利範圍替換本(95年1〇月) 说御,乙__正眷: •Ί 拾、申請專利範圍 ^ 一種熱力安定磁性奈米粒子(22),包括磁性核心(24,34) 與非磁性成份(26,36),該磁性核心於室溫/操作溫度下呈 鐵磁f生σ亥非磁性成份則封裝該磁性核心,使該磁性奈 米粒子電絕緣,並避免被環境污染,該磁性奈米粒子具 有預定可調整縱橫比,而且具有適用mmHz-GHz範圍頻 率之滲透性與鐵磁性共振。 2·如申請專利範圍第1項之熱力安定磁性奈米粒子(22),其 中該磁性核心(24,34)係由鐵磁性元素所組成,該鐵磁性 元素係選自鐵(Fe)、鈷(Co)與鎳(Ni)所組成之群組。 3·如申請專利範圍第1項之熱力安定磁性奈米粒子(22),其 中該磁性核心(24,34)由鐵磁性元素之二元或三元合金 所組成,該該鐵磁性元素係選自鐵(1^)、鈷((:〇)與鎳(Ni) 所組成之群組。 4·如前述申請專利範圍第1、2或3項之熱力安定磁性奈米 粒子(22) ’其中該磁性核心(24,34)包括單一磁域。,、 5·如前述申請專利範圍第I、2或3項之熱力安定磁性奈米 粒子(22),其中該磁性粒子的直徑(28,38)與長度 在約2至600 nm範圍内。 如申請專利範圍第5項之熱力安定磁性太 不木粒子(22), 其中該鐵磁性核心(24,34)之結晶結構你料p日丄 傅1糸封閉式六邊形 6. 1284330月\>曰修(乘)正替換頁 7.如申請專利範圍第5項之熱力安定磁性奈米粒子(22),其 中該鐵磁性核心(24,34)之結晶結構係體心立方體。 8·如申請專利範圍第5項之熱力安定磁性奈米粒子(22),其 中該鐵磁性核心(24,34)之結晶結構係面心立方體。 9·如前述申請專利範圍第丨、2或3項之熱力安定磁性奈米 粒子(22),其中封裝該磁性核心(24,34)之非磁性成份 (26,36)係一種有機配位體。 I 0.如申請專利範圍第9項之熱力安定磁性奈米粒子,其 中該有機配位體係胺與羧酸之組合物。 II ·如申請專利範圍第9項之熱力安定磁性奈米粒子(22),其 中《亥有機配位體係油稀基胺與油酸之組合物。 12.如申請專利範圍第丨、2或3項之熱力安定磁性奈米粒子 (22)其用於兩頻積體電路應用之被動組件中。 13· —種磁性奈米材料(3〇),包括前述申請專利範圍任一項 之熱力安定磁性奈米粒子(22)的組合體。 14·如申请專利範圍第13項之磁性奈米材料(3〇),其中各個 磁性奈来粒子(22)具有與其他磁性奈米粒子彼此對準之 各向異性轴。 1 5·如申請專利範圍第13或14項之磁性奈米材料(3〇),其中 該磁性奈米材料的每個磁性奈米粒子(22)係單一尺寸、 形狀與磁性定向。 16· 一種合成磁性奈米粒子(22)之方法,包括以下步驟: 提供第一溶液(14),該溶液包括一種溶劑與羧酸和胺; 將第一溶液添加(16)於金屬有機先質,形成第二溶液; 1284330 ^^__._ 1¾作修(粟)正替換頁 17. 在壓力之下加熱第二溶液(18)—段預定時間,製得熱 力安定磁性奈米粒子(22),其包括磁性核心(24,34)與非 磁性成份(26,36),該磁性核心於室溫/操作溫度下呈鐵磁 性’該非磁性成份則封裝該磁性核心,使該磁性奈米粒 子避免被環境污染並且電絕緣,該磁性奈米粒子具有預 疋可调整縱橫比,而且具有適用於MHz_GHz範圍頻率之 滲透性與鐵磁性共振。 如申请專利範圍第16項之磁性奈米粒子(22)之合成方法 ’其中提供第-溶液步驟(14)進—步包括添加—種鱗作 為溶劑。18. 19. 如申請專利範圍第16項之磁性奈米粒子(22)之合成方法 ’其中提供第-溶液步驟(14)進—步包括添加一種芳族 溶劑,其係選自甲苯與甲氧基苯所組 如申請專利範圍第一任—項之磁群:奈米粒子 (22)之合成方法,其中提供第一溶液步驟⑽進—步包 括添加一種油酸作為該鲮酸。 20. 21. 如申請專利範圍第16训中任—項之磁性奈来粒 (22)之合成方法’其中提供第一溶液步驟⑽進—步 括添加一種油烯基胺作為該胺。 如I請專㈣UK18射任-項之糾奈米粒子( 之合成方法,其中提供第一溶液步驟(A進一步包: 加一種烴金屬複合物作為該金屬有機先質。 如申請專利範圍第16·18項中 ° (22)之人&古、么甘士, 項之磁性奈米粒 ()之&成方法,其中提供第-溶液步驟⑽進—步22. 12843301$°月作修(象)正替換頁 括/4、加種姑先質作為該金屬有機先質。 23.如申睛專利範圍第16-18項中任一項之磁性奈米粒子 (22)之合成方法,其中提供加熱步驟(18)進一步包括於 約1與10巴H2或含H2氣體混合物之壓力下,以100與250 °C之間的溫度加熱約3至60小時。-4 ·
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US7485366B2 (en) * | 2000-10-26 | 2009-02-03 | Inframat Corporation | Thick film magnetic nanoparticulate composites and method of manufacture thereof |
US20050128842A1 (en) * | 2003-11-07 | 2005-06-16 | Alexander Wei | Annular magnetic nanostructures |
ES2242528B1 (es) | 2004-03-25 | 2006-12-01 | Consejo Sup. Investig. Cientificas | Nanoparticulas magneticas de metales nobles. |
US7932721B2 (en) * | 2006-04-07 | 2011-04-26 | The United States Of America As Represented By The Department Of Health And Human Services | Inductive decoupling of a RF coil array |
US7680553B2 (en) * | 2007-03-08 | 2010-03-16 | Smp Logic Systems Llc | Methods of interfacing nanomaterials for the monitoring and execution of pharmaceutical manufacturing processes |
DE102008026658A1 (de) | 2007-11-13 | 2009-05-14 | Council Of Scientific & Industrial Research | Verfahren zur Herstellung von Nanodrähten aus Metalloxiden mit Dotiermitteln in niedrigem Valenzzustand |
WO2010071459A1 (en) | 2008-12-19 | 2010-06-24 | Victoria Link Limited | Magnetic nanoparticles |
WO2010079781A1 (ja) * | 2009-01-06 | 2010-07-15 | 国立大学法人九州大学 | ファイバー状ニッケルおよびその製造方法 |
AU2010232430B2 (en) | 2009-04-03 | 2014-08-28 | The United States Of America, As Represented By The Secretary, Department Of Health And Human Services | Magnetic microstructures for magnetic resonance imaging |
WO2011075516A2 (en) | 2009-12-18 | 2011-06-23 | President And Fellows Of Harvard College | Active scaffolds for on-demand drug and cell delivery |
FR2955853B1 (fr) | 2010-02-02 | 2012-03-09 | Inst Nat Sciences Appliq | Procede de fabrication de nano-batonnets epitaxies sur un support, nano-batonnets epitaxies obtenus par un tel procede et support d'enregistrement de donnees numeriques |
JP5175884B2 (ja) * | 2010-03-05 | 2013-04-03 | 株式会社東芝 | ナノ粒子複合材料、それを用いたアンテナ装置及び電磁波吸収体 |
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US8840800B2 (en) * | 2011-08-31 | 2014-09-23 | Kabushiki Kaisha Toshiba | Magnetic material, method for producing magnetic material, and inductor element |
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