TWI685581B - 磁性材濺鍍靶及其製造方法 - Google Patents
磁性材濺鍍靶及其製造方法 Download PDFInfo
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- TWI685581B TWI685581B TW105106458A TW105106458A TWI685581B TW I685581 B TWI685581 B TW I685581B TW 105106458 A TW105106458 A TW 105106458A TW 105106458 A TW105106458 A TW 105106458A TW I685581 B TWI685581 B TW I685581B
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- 239000000696 magnetic material Substances 0.000 title claims abstract description 40
- 238000005477 sputtering target Methods 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 52
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000001301 oxygen Substances 0.000 claims abstract description 32
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 32
- 229910052796 boron Inorganic materials 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims description 84
- 239000000843 powder Substances 0.000 claims description 43
- 229910052782 aluminium Inorganic materials 0.000 claims description 37
- 238000005266 casting Methods 0.000 claims description 19
- 238000009689 gas atomisation Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 238000005245 sintering Methods 0.000 claims description 15
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- 229910052735 hafnium Inorganic materials 0.000 claims description 13
- 229910052726 zirconium Inorganic materials 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004544 sputter deposition Methods 0.000 description 23
- 239000012535 impurity Substances 0.000 description 13
- 239000007789 gas Substances 0.000 description 11
- 238000007731 hot pressing Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 238000000227 grinding Methods 0.000 description 10
- 238000005520 cutting process Methods 0.000 description 9
- 238000000889 atomisation Methods 0.000 description 8
- 239000010408 film Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 230000006698 induction Effects 0.000 description 8
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 229910020674 Co—B Inorganic materials 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 229910017061 Fe Co Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001036 glow-discharge mass spectrometry Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 239000013076 target substance Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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Abstract
一種磁性材濺鍍靶,係由至少含有Co及/或Fe以及B,且含有10~50at%之B的燒結體構成,氧含量在100wtppm以下。本發明之磁性材濺鍍靶,由於可抑制因氧化物所導致之顆粒的發生,因此具有下述顯著之效果:可提升製作磁電阻膜等時之產率。
Description
本發明為一種藉由粉末燒結法製造之含有硼(B)之磁性材濺鍍靶,係關於一種濺鍍時之顆粒(particle)發生少,對於磁頭、磁阻元件(MRAM)等用途有用之磁性材濺鍍靶及其製造方法。
於磁頭、MRAM,採用有具高磁阻效果之穿隧磁阻膜,在使用於構成此膜之相的材料之中,使用有含硼(B)之磁性體。例如已知有由Co、Fe等與硼構成之組成Co-B、Fe-B、Co-Fe-B或於此等添加有Al、Cu、Mn、Ni等之組成等。
含有B之磁阻膜,例如為Co-Fe-B之情形時,係對Co-Fe-B之濺鍍靶進行濺鍍來製作。此種磁性材靶,係藉由粉末冶金法或熔解鑄造法來製作,但含有大量B之情形時,尤其是若B之組成比超過10at%,則由於會形成具有非常脆之特性的Co或Fe之硼化物相,故於以熔解法製作之情形時,鑄錠會裂開,發生龜裂,而難以製成濺鍍靶。另,具有藉由嚴格之製造步驟之控管,而可製造濺鍍靶之方法(專利文獻1),雖然具有可降低氧等氣體成分之大優點,但是製造步驟具有難度。
另一方面,於以燒結法製作之情形時,雖然不會發生如上述之熔解物特有之問題,但由於原料粉末之比表面積大於總體(bulk),故容易大量混入為氣體成分之氧,其會與磁性材靶所含之金屬雜質形成氧化
物,而在濺鍍時成為產生顆粒之一個原因。通常,顆粒由於會使濺鍍膜之膜質降低,使磁頭或MRAM等磁裝置之特性不穩定,從種種觀點來看,尋求其降低,如何地於濺鍍靶中減少顆粒是極為重要之課題。
另,關於磁性材靶,於先前專利,有幾種建議。例如,於專利文獻2,記載有一種用以形成被用於垂直磁記錄媒體等之軟磁性膜的Fe-Co-B系合金靶材,可實現低磁導率,具有良好之濺鍍特性。又,於專利文獻3,則記載有一種使Fe-Co系合金之Fe:Co之at比為10:90~70:30,且含有0.2~5.0at%之Al或Cr之1種或2種而成。然而,不論是專利文獻2或專利文獻3皆未著眼於靶之雜質或起因於靶之雜質的顆粒。
專利文獻1:國際公開WO2011/070860號公報
專利文獻2:日本特開2004-346423號公報
專利文獻3:日本特開2008-121071號公報
提出一種磁性材靶,係藉由降低磁性材濺鍍靶中之氧含量,而當於磁控濺鍍裝置進行濺鍍時,可抑制顆粒之發生,能夠提升製作薄膜時之產率。尤其課題在於提供一種用以形成MRAM用途以及磁頭或者其他之磁裝置用途之膜的濺鍍靶及其製造方法。
為了解決上述課題,本發明人進行潛心研究之結果,得知對製程下功夫以抑制原料粉末之表面氧化,且Co-B、Fe-B、Co-Fe-B含有較多之Al及Si,發現藉由極力減少此等之雜質,抑制在燒結時與吸附於原料粉末之氧反應成為氧化物,可顯著減少其所導致之顆粒的發生。本案
基於此見解,提供以下之發明。
1)一種磁性材濺鍍靶,係由至少含有Co及/或Fe以及B,且含有10~50at%之B的燒結體構成,氧含量在100wtppm以下。
2)如上述1)記載之磁性材濺鍍靶,其中,Al及Si之合計含量在100wtppm以下。
3)如上述1)或2)記載之磁性材濺鍍靶,其中,Al、Ba、Hf、Li、Mg、Si、Sr、Ti及Zr之合計含量在100wtppm以下。
4)一種磁性材濺鍍靶之製造方法,係對Co原料及/或Fe原料以及B原料進行熔解鑄造,製作合金鑄錠後,對合金鑄錠藉由氣體霧化法製作原料粉末,然後,將其燒結製成靶。
5)如上述4)記載之磁性材濺鍍靶之製造方法,其將熔解鑄造所得到之合金鑄錠的最後凝固部切除,藉由氣體霧化法將鑄錠剩餘部分製成原料粉末。
6)如上述4)或5)記載之磁性材濺鍍靶之製造方法,其使原料粉末之粒徑為53~300μm。
本發明之磁性材濺鍍靶其特徵在於:在靶中為氣體雜質之氧的含量少,且容易形成氧化物之金屬雜質(尤其是Al及Si)之含量少。其結果,具有下述顯著之效果:可抑制氧化物所導致之顆粒的發生,提升製作薄膜時之產率,且可使磁頭或MRAM等之裝置特性穩定。
本發明之磁性材濺鍍靶係由至少含有Co及/或Fe以及B,且含有10~50at%之B的燒結體構成。若B含量未達10at%,則無法保有作為本發明之磁性材靶的特性。又,當B含量超過50at%之情形時亦相同,又,當B過多之情形時,亦會發生下述缺點:脆性變大,強度下降,容易裂開。因此,較佳使B含量在10at%以上,50at%以下。另,若可維持本發明之效果,則添加其他元素亦是有效的。
於本發明中重要的是使磁性材濺鍍靶中之氧含量在100wtppm以下。靶中之氧量會強烈影響濺鍍時之顆粒。作為此雜質之氧為當初以氧化物之形態含有於原料者,或是然後附著之氧與金屬雜質結合形成氧化物者。若在磁性材靶中存在由此氧化物構成之非磁性材料,則會有下述傾向:於濺鍍時會以其為起點發生異常放電,使顆粒增加。
本發明藉由降低原料粉末中之氧量,或如後述般降低會形成氧化物之金屬雜質的含量,來抑制會導致發生此種顆粒之氧化物的形成。為了降低氧,氣體霧化處理為有效之手段,但僅使用氣體霧化法的話,無法充分降低氧量。本發明人作進一步之研究後,結果發現:氣體霧化原料中已含有氧化物,以及調整氣體霧化原料之粒徑是重要的。
根據此種見解,於本發明,在進行氣體霧化處理前將原料熔解,去除氧化物及其他雜質,且以氣體霧化法製作燒結原料粉後,藉由使用密閉容器(手套箱)等在非活性環境內對其進行粒徑調整,藉此而可極為顯著地將氧含量降低至100wtppm,這是以往無法辦到的。藉此,可消除「由於原料粉末之表面積大於總體,因此氧量容易變高」之粉末冶金法特有之問題。
又,本發明之磁性材濺鍍靶之特徵在於:Al與Si之合計含量在100wtppm以下。已知Al、Si會以雜質之形式相對較多地含有於硼(B)中。又,此等Al及Si作為氧化物較穩定,認為此等是顆粒的主要原因之一。因此,於以B作為構成成分之本發明之靶,除了氧在100ppm以下之外,亦藉由使Al與Si在100ppm以下,而可進一步減少顆粒。
此種Al或Si之氧化物,可在進行氣體霧化處理之前藉由將原料熔解來去除。容易與氧結合且容易混入本發明之靶的金屬雜質,有Al、Ba、Hf、Li、Mg、Si、Sr、Ti、Zr,使此等之合計含量在100ppm以下,藉此可更加減少顆粒。此等元素之氧化物亦與上述同樣地可在進行氣體霧化處理之前,藉由將原料熔解來去除。
接著,說明本發明之磁性材濺鍍靶之製造方法。
首先,將B原料、Co原料、Fe原料秤量成規定之組成後,使用高頻感應加熱方式之真空爐等將原料熔解、鑄造,製造合金鑄錠。此時,原料中所含之氧當在真空爐內熔解時會與B、Al、Si等反應形成氧化物,懸浮於熔液之上部。將其放液時使用餵槽使氧化物浮出,將相當於鑄錠之最後凝固部的鑄錠上端部切除,藉此可將此氧化物去除。又,對於容易含於Co原料之Ni,較佳使用預先進行純化將Ni降低至30ppm左右以下之原料。又,對於B原料亦同樣地,較佳使用將Al或Si其他雜質降低至100ppm左右之原料。
將剩下之合金鑄錠切割成適當之尺寸,投入霧化處理用之坩堝製成霧化原料。接著,將此合金熔解後,一邊將氬氣體吹送至安裝在坩堝底部之噴嘴前端,一邊進行噴射製作霧化粉末。然後,在氮環境之手套
箱內對此霧化粉末進行篩選,以粒徑成為53~300μm之方式進行粒徑調整。藉由使粒徑為53~300μm,若使粒徑未達53μm,則由於填充時會吸附氧而使得氧含量增加,故不佳。又,藉由使原料粉末之粒度一致,亦具有可提高燒結性,穩定地得到高密度之靶的效果。
使用熱壓裝置,於溫度750~1240℃、加壓力150~500kgf/cm2、保持時間1~3小時、真空環境之條件下,對此氣體霧化粉進行成型、燒結,製作燒結體。成型、燒結不限於熱壓,亦可使用電漿放電燒結法、熱靜水壓燒結法。上述之燒結條件,可根據所燒結之材料的種類任意地加以調整。接著可藉由車床或平面研磨等之機械加工,將燒結體加工成想要之尺寸、形狀之靶。
以下,根據實施例及比較例進行說明。另,本實施例僅是一例示,並不受到此例示之任何限制。亦即,本發明僅受申請專利範圍之限制,包含本發明所含之實施例以外的各種變形。
(實施例1)
將Co原料、Fe原料、B原料秤量成70Fe-10Co-20B(at%),使用高頻感應加熱式之真空爐進行熔解,得到直徑170mm、厚度50mm之鑄造鑄錠。將相當於鑄造時之最後凝固部的鑄錠上端約5mm除去,對剩下之鑄錠進行切割,製成霧化用之原料。接著,對其進行氣體霧化處理,製作燒結用之原料粉末,在Ar流之手套箱內將此粉末調整至粒徑為53~300μm。
接著,於真空中以950℃×3小時、300kgf/cm2之條件,以熱壓對此原料粉末進行燒結,製作70Fe-10Co-20B之燒結體。用車床進
行切削加工及平面研磨加工將該燒結體精加工,得到直徑180mm、厚度5mm之圓盤狀靶。自靶端材採集樣品,進行GDMS分析,結果Al及Si之合計含量為50wtppm,Al、Ba、Hf、Li、Mg、Si、Sr、Ti、Zr之含量在100wtppm以下。使用氧、氮分析裝置(LECO公司製)進行分析,結果氧含量為60wtppm。
使用以此方式製作之磁性材濺鍍靶實施濺鍍。使濺鍍條件為濺鍍功率1.0kW、Ar氣壓4Pa,於1kWhr放電的時候,在4吋Si晶圓以目標膜厚100nm進行濺鍍,對附著在晶圓上之顆粒以surfscan進行顆粒個數之測量。其結果,可將顆粒數抑制在5個。將以上之結果示於表1。
(比較例1)
將Co原料、Fe原料、B原料秤量成70Fe-10Co-20B(at%)後,在不進行熔解鑄造下,進行氣體霧化處理,製作氣體霧化粉。然後,在大氣中對此原料粉末進行篩選而調整為粒徑300μm以下之後,使用熱壓,於真空中,以950℃×3小時、300kgf/cm2之條件進行燒結,製作由70Fe-10Co-20B構成之燒結體。並且,用車床進行切削加工及平面研磨加工將該燒結體精加工,得到直徑180mm、厚度5mm之圓盤狀靶。
自靶端材採集樣品,使用與實施例1同樣之方法進行分析,Al及Si之合計含量為120wtppm,Al、Ba、Hf、Li、Mg、Si、Sr、Ti、Zr之含量超過100wtppm,氧含量為180wtppm。又,使用以此方式製作之磁性材靶,以與實施例1相同之條件,實施濺鍍,結果顆粒數增加至15個。
(實施例2)
將Fe原料、B原料秤量成80Fe-20B(at%),使用高頻感應加熱式之真空爐進行熔解,得到直徑170mm、厚度50mm之鑄造鑄錠。將相當於鑄造時之最後凝固部的鑄錠上端約5mm除去,對剩下之鑄錠進行切割,製成霧化用之原料。接著,對其進行氣體霧化處理,製作燒結用之原料粉末,在手套箱內將此粉末調整至粒徑為53~300μm。
接著,於真空中以950℃×3小時、300kgf/cm2之條件,以熱壓對此原料粉末進行燒結,製作80Fe-20B之燒結體。用車床進行切削加工及平面研磨加工將該燒結體精加工,得到直徑180mm、厚度5mm之圓盤狀靶。自靶端材採集樣品,使用與實施例1同樣之方法進行分析,結果Al及Si之合計含量為50wtppm,Al、Ba、Hf、Li、Mg、Si、Sr、Ti、Zr之
含量在100wtppm以下,氧含量為70wtppm。
對以此方式製作之磁性材濺鍍靶實施濺鍍。使濺鍍條件為與實施例1相同之條件。對附著在晶圓上之顆粒以surfscan進行顆粒個數之測量,結果可將顆粒數抑制在5個。
(實施例3)
將Co原料、B原料秤量成80Co-20B(at%),使用高頻感應加熱式之真空爐進行熔解,得到直徑170mm、厚度50mm之鑄造鑄錠。將相當於鑄造時之最後凝固部的鑄錠上端約5mm除去,對剩下之鑄錠進行切割,製成霧化用之原料。接著,對其進行氣體霧化處理,製作燒結用之原料粉末,在手套箱內將此粉末調整至粒徑為53~300μm。
接著,於真空中以950℃×3小時、300kgf/cm2之條件,以熱壓對此原料粉末進行燒結,製作80Co-20B之燒結體。用車床進行切削加工及平面研磨加工將該燒結體精加工,得到直徑180mm、厚度5mm之圓盤狀靶。自靶端材採集樣品,使用與實施例1同樣之方法進行分析,結果Al及Si之合計含量為60wtppm,Al、Ba、Hf、Li、Mg、Si、Sr、Ti、Zr之含量在100wtppm以下,氧含量為50wtppm。
使用以此方式製作之磁性材濺鍍靶實施濺鍍。使濺鍍條件為與實施例1相同之條件。對附著在晶圓上之顆粒以surfscan進行顆粒個數之測量,結果可將顆粒數抑制在8個。
(實施例4)
將Co原料、Fe原料、B原料秤量成55Fe-15Co-30B(at%),使用高頻感應加熱式之真空爐進行熔解,得到直徑170mm、厚度50mm之鑄造鑄
錠。將相當於鑄造時之最後凝固部的鑄錠上端約5mm除去,對剩下之鑄錠進行切割,製成霧化用之原料。接著,對其進行氣體霧化處理,製作燒結用之原料粉末,在手套箱內將此粉末調整至粒徑為53~300μm。
接著,於真空中以1000℃×3小時、300kgf/cm2之條件,以熱壓對此原料粉末進行燒結,製作55Fe-15Co-30B之燒結體。用車床進行切削加工及平面研磨加工將該燒結體精加工,得到直徑180mm、厚度5mm之圓盤狀靶。自靶端材採集樣品,使用與實施例1同樣之方法進行分析,結果Al及Si之合計含量為64wtppm,Al、Ba、Hf、Li、Mg、Si、Sr、Ti、Zr之含量在100wtppm以下,氧含量為60wtppm。
使用以此方式製作之磁性材濺鍍靶實施濺鍍。使濺鍍條件為與實施例1相同之條件。對附著在晶圓上之顆粒以surfscan進行顆粒個數之測量,結果可將顆粒數抑制在8個。
(比較例2)
將Co原料、Fe原料、B原料秤量成55Fe-15Co-30B(at%)後,在不進行熔解鑄造下,進行氣體霧化處理,製作氣體霧化粉。然後,在大氣中對此原料粉末進行篩選而調整為粒徑300μm以下之後,使用熱壓,於真空中,以1000℃×3小時、300kgf/cm2之條件進行燒結,製作由55Fe-15Co-30B構成之燒結體。並且,用車床進行切削加工及平面研磨加工將該燒結體精加工,得到直徑180mm、厚度5mm之圓盤狀靶。
自靶端材採集樣品,使用與實施例1同樣之方法進行分析,Al及Si之合計含量為180wtppm,Al、Ba、Hf、Li、Mg、Si、Sr、Ti、Zr之含量超過100wtppm,氧含量為230wtppm。又,使用以此方式製作之磁性材
靶,以與實施例1相同之條件,實施濺鍍,結果顆粒數增加至22個。
(實施例5)
將Co原料、Fe原料、B原料秤量成55Fe-15Co-30B(at%),使用高頻感應加熱式之真空爐進行熔解,得到直徑170mm、厚度50mm之鑄造鑄錠。將相當於鑄造時之最後凝固部的鑄錠上端約5mm除去,對剩下之鑄錠進行切割,製成霧化用之原料。接著,對其進行氣體霧化處理,製作燒結用之原料粉末,在手套箱內將此粉末調整至粒徑為100~300μm。
接著,於真空中以1000℃×3小時、300kgf/cm2之條件,以熱壓對此原料粉末進行燒結,製作55Fe-15Co-30B之燒結體。用車床進行切削加工及平面研磨加工將該燒結體精加工,得到直徑180mm、厚度5mm之圓盤狀靶。自靶端材採集樣品,使用與實施例1同樣之方法進行分析,結果Al及Si之合計含量為55wtppm,Al、Ba、Hf、Li、Mg、Si、Sr、Ti、Zr之含量在100wtppm以下,氧含量為40wtppm。
使用以此方式製作之磁性材濺鍍靶實施濺鍍。使濺鍍條件為與實施例1相同之條件。對附著在晶圓上之顆粒以surfscan進行顆粒個數之測量,結果可將顆粒數抑制在4個。
(比較例3)
將Co原料、Fe原料、B原料秤量成55Fe-15Co-30B(at%)後,使用高頻感應加熱式之真空爐進行熔解,得到直徑170mm、厚度50mm之鑄造鑄錠。將相當於鑄造時之最後凝固部的鑄錠上端約5mm除去,對剩下之鑄錠進行切割,製成霧化用之原料。接著,對其進行氣體霧化處理,製作燒結用之原料粉末,在大氣中將此粉末調整為粒徑300μm以下。
接著,使用熱壓,於真空中,以1000℃×3小時、300kgf/cm2之條件對此原料粉末進行燒結,製作55Fe-15Co-30B之燒結體。用車床進行切削加工及平面研磨加工將該燒結體精加工,得到直徑180mm、厚度5mm之圓盤狀靶。自靶端材採集樣品,使用與實施例1同樣之方法進行分析,Al及Si之合計含量為90wtppm,Al、Ba、Hf、Li、Mg、Si、Sr、Ti、Zr之含量在100wtppm以下,氧含量為150wtppm。
使用以此方式製作之磁性材靶實施濺鍍。使濺鍍條件為與實施例1相同之條件。對附著在晶圓上之顆粒以surfscan進行顆粒個數之測量,結果顆粒數增加至13個。
(實施例6)
將Co原料、Fe原料、B原料秤量成45Fe-15Co-40B(at%),使用高頻感應加熱式之真空爐進行熔解,得到直徑170mm、厚度50mm之鑄造鑄錠。將相當於鑄造時之最後凝固部的鑄錠上端約5mm除去,對剩下之鑄錠進行切割,製成霧化用之原料。接著,對其進行氣體霧化處理,製作燒結用之原料粉末,在手套箱內將此粉末調整至粒徑為100~300μm。
接著,於真空中以1100℃×3小時、300kgf/cm2之條件,以熱壓對此原料粉末進行燒結,製作45Fe-15Co-40B之燒結體。用車床進行切削加工及平面研磨加工將該燒結體精加工,得到直徑180mm、厚度5mm之圓盤狀靶。自靶端材採集樣品,使用與實施例1同樣之方法進行分析,結果Al及Si之合計含量為90wtppm,Al、Ba、Hf、Li、Mg、Si、Sr、Ti、Zr之含量在100wtppm以下,氧含量為80wtppm。
使用以此方式製作之磁性材濺鍍靶實施濺鍍。使濺鍍條件為
與實施例1相同之條件。對附著在晶圓上之顆粒以surfscan進行顆粒個數之測量,結果可將顆粒數抑制在9個。
本發明之磁性材濺鍍靶,由於靶中之氧含量少,且容易形成氧化物之Al、Si的含量少,因此具有下述優異之效果:可抑制氧化物所導致之顆粒的發生,提升製作薄膜時之產率。作為磁頭或MRAM等磁裝置用之磁性薄膜形成用濺鍍靶有用。
Claims (7)
- 一種磁性材濺鍍靶,係由至少含有Co及/或Fe以及B,且含有10~50at%之B的燒結體構成,Al及Si之合計含量在50wtppm以上且100wtppm以下,氧含量在100wtppm以下。
- 如申請專利範圍第1項之磁性材濺鍍靶,其中,Al、Ba、Hf、Li、Mg、Si、Sr、Ti及Zr之合計含量在50wtppm以上且100wtppm以下。
- 一種磁性材濺鍍靶之製造方法,係對Co原料及/或Fe原料以及B原料進行熔解鑄造,製作合金鑄錠後,對合金鑄錠藉由氣體霧化法製作原料粉末,然後,將其燒結製成靶,其特徵在於:該靶係由至少含有Co及/或Fe以及B,且含有10~50at%之B的燒結體構成,Al及Si之合計含量在50wtppm以上且100wtppm以下,氧含量在100wtppm以下。
- 如申請專利範圍第3項之磁性材濺鍍靶之製造方法,其中,Al、Ba、Hf、Li、Mg、Si、Sr、Ti及Zr之合計含量在50wtppm以上且100wtppm以下。
- 如申請專利範圍第3或4項之磁性材濺鍍靶之製造方法,其將熔解鑄造所得到之合金鑄錠的最後凝固部切除,藉由氣體霧化法將鑄錠剩餘部分製成原料粉末。
- 如申請專利範圍第3或4項之磁性材濺鍍靶之製造方法,其使原料粉末之粒徑為53~300μm。
- 如申請專利範圍第5項之磁性材濺鍍靶之製造方法,其使原料粉末之粒徑為53~300μm。
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JP6553755B2 (ja) | 2016-02-19 | 2019-07-31 | Jx金属株式会社 | 磁気記録媒体用スパッタリングターゲット及び磁性薄膜 |
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JP2021109980A (ja) | 2020-01-06 | 2021-08-02 | 山陽特殊製鋼株式会社 | スパッタリングターゲット材の製造方法 |
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