TW554341B - Optical information medium and its use - Google Patents

Optical information medium and its use Download PDF

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Publication number
TW554341B
TW554341B TW090126580A TW90126580A TW554341B TW 554341 B TW554341 B TW 554341B TW 090126580 A TW090126580 A TW 090126580A TW 90126580 A TW90126580 A TW 90126580A TW 554341 B TW554341 B TW 554341B
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Taiwan
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layer
optical information
recording layer
recording
patent application
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TW090126580A
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English (en)
Inventor
Johannes Cornelis Norb Rijpers
Guo-Fu Zhou
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Koninkl Philips Electronics Nv
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
    • G11B7/2433—Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B7/2578—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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    • G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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    • G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
    • G—PHYSICS
    • G11—INFORMATION STORAGE
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
    • G11B2007/25706—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing transition metal elements (Zn, Fe, Co, Ni, Pt)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
    • G11B2007/2571—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing group 14 elements except carbon (Si, Ge, Sn, Pb)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
    • G11B2007/25715—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing oxygen
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
    • G11B2007/25716—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing sulfur
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
    • G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
    • G11B7/2534—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins polycarbonates [PC]
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
    • G11B7/2542—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers consisting essentially of organic resins
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    • G11—INFORMATION STORAGE
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    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
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    • G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
    • G11B7/2585—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on aluminium

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Optical Recording Or Reproduction (AREA)

Description

554341 A7 ________B7 五、發明説明（彳 ） 本發明關於一光學資訊媒體，以具有雷射光波長之雷射 光束方式，作可擦拭記錄，該媒體具有一基板及一備於其 上之堆疊層，堆疊層含： -一記錄層，其能在非晶態及晶態間改變，該記錄層位於 第一介電層與第二介電層之間，及 -一光吸收層接近記錄層。 本發明亦關於使用此一光學資訊媒體作高速記錄。 首段所述之此型光學資訊媒體，曾揭示於美專利 US-A-5,652,036中。該媒體有一載有堆疊層之基板，該層 含首段說明之各層及其他層。 根據相位改變原理之光學儲存媒體甚有吸引力，因其將 直接修改（DO W)高儲存密度結合，與僅讀光學資料儲存系 統有易相容性。相位改變光學記錄涉及利用聚焦之相當高 功率雷射光束，在晶態記錄層中形成次微米尺寸之非晶態 •記錄記號。資訊之記錄期間，媒體與聚焦之雷射光束相對 移動，其根據有待記錄之資訊調變。當高功率雷射光束熔 化晶態記錄層時，記錄記號即可形成。當雷射光束關閉及/ 或移向記錄層時，記錄層中熔化之記號發生熄滅，在記錄 層之曝露區，留下資訊記號，記錄層在未曝露區仍然保留 晶態。已寫入之非晶態之擦拭，經以同一雷射以較低之功 率位準加熱，由再晶化而得以完成，而不會熔化記錄層。 非晶態記號代表資料位元，其可經由相當低之雷射光束經 基板璜出。非晶態記號對晶態記錄層之反射差異，發生一 調變之雷射光束，其稍後被偵測器，根據記錄之資訊，轉 -4- 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公釐) 554341
換為調變之光電流。 相位改變光學記錄中最重要之需求為高資料率， 料可被以至少30 Μ位元/秒之速率，耷Α β $办 ·、 貝 <干罵入及再寫入於媒體中 。此中高資料速率需要記錄層有—高晶格化速度即短 晶態化時間。為保證前所記錄之非晶態記號，在再寫人期 間能再晶態化’記錄層必須有-適當之晶態化速度，以匹 配媒體對雷射光束之速度。如晶態化速度不夠高，以前a 錄之非晶態記號’其代表舊資料’無法完全擦拭，音即在 DOW期間再晶態化》此舉可造成高雜訊位準。高晶態化速 度在高記錄密度及高資料率光學記錄媒體，如碟形dvd + RW，DVR-紅及藍尤其需要，概字為—縮寫，代新一代高 密度數位多功能磁碟+RW，其中之Rw代表每—磁碟之再 寫入能力，及數位視頻記錄光學儲存磁碟，其中之紅與藍 代表使用之雷射波長。以此等磁碟而言，完全擦拭時間 (CET)最多必須為60 ns。CET之定義為一寫入非晶態記號之 完全晶態化，以靜態測量，擦拭脈波之最小間隔。以dvd + RW而言，其有一每120 mm之磁碟4.7 GB記錄密度，需要 33 Μ位元/s，以DVR-紅而言，速率為35 Μ位元/s ,以DVR_ 藍言，用戶資料率應高於50 Μ位元/s。 相位改變光學記錄媒體之另一重要項目為獲得高健存容 置’以便該媒體可適於作局也、度έ己錄，即，儲存容量在12 〇 m rn磁碟直控時超過3 G位元組。相位改變光學資訊媒體之 儲存密度，由記號之徑向密度及切面密度決定。磁道節距 決定徑向密度，即，相鄰之磁道中線間之距離。磁道節距 -5- 本紙張尺度適用中國國家標準(CNS) Α4規格(210Χ 297公釐)
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線 554341
受到熱串話之限制。音g 市J思即磁道中記錄之資料之品質受相鄰 磁道之影響。記錄之記號之开，灿_ 州 己就之形狀可能失真，而導致大跳動。切、㈣度由頻道位元長度衫，當使用標準之刪堆疊 時，其受非晶態之光吸收較晶態為高之限制。此堆疊中，! 代表-介電層，P代表相位改變記錄層，m代表反射或鏡層 因此一田σ己錄層以雷射輻射時，非晶態部份受熱較晶態 邛伤為同‘果’在晶態區所寫入之記號較在非晶區所再 寫入者為小。此一現象造成跳動增加，其與頻道位元長度 之相反成比例。為克服此一問題，單獨在記錄層之晶態區 之田射光吸收量’較佳為等於或大於在記錄層之非晶態區 吸收之雷射光量。此等吸收量分別縮寫為、及。 自該美專利號碼1；3-八-5,652,036得知，有許多可能堆疊 置換，即，IAIPIM堆疊，其中之j，卩及“為有上述之意義 ’ A代表光吸收層。光吸收層含介電材料及金屬或半導體 •材料之混合。光吸收層增加之結果為A。與、間之差異較小 ，因而降低記號失真。 已知記錄媒體之缺點為，其僅適於在相當長雷射光波長 約6 80 nm之記錄。高密度記錄較佳利用較小波長，即45〇 nm ’因為雷射記錄點之直徑與使用之雷射光波長成正比。較 小雷射記錄光點可導致較小之非晶態記號，因此，導致較 咼可能之記錄密度。在波長400 nm時，該已知光吸收層包 含介電材料及金屬或半導體材料，因為金屬及半導體材料 之光擴散特性，通常較波長6 80 nm有較高之吸收。因而使 光學記錄媒體之設計及製造之空間不大。光吸收層中之短 -6 - 本纸張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐)
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線 554341 A7 ____ B7 五、發明説明（4 ) 波長雷射光之吸收，對該層之組成成分與及厚度之微小變 化甚為敏感。此外，其厚度必須甚小，因為其高吸收，在 製造之觀點甚不理想。 本發明之一目的為提供一光學資訊媒體，供首段所提之 型式之可擦拭之記錄，其適於在350-450 nm之雷射波長， 且容易製造之高資料率及高密度記錄。 此目的之達成，係因為光吸收層包含公式qRx之複合物 ’其中 ’ Q 為一選自含 Si、Ge、Ti、Zr、Hf、Nb、Ta 之一 組，R為一元素，選自含〇及N之一組，及0<χ<2·5 ,以便達 到0.8<AC/Aa<l .50 ’其中八。及Aa為在晶態中及非晶態中，雷 射波長在350-450 nm之記錄層中，吸收之雷射光之量。 高資料率一詞，如上所提，其意義為媒體對至少72 m/s 之雷射光之線性速度，其為緊密磁碟標準速度之六倍。重 要參數為CET，如上所限定。CET與晶態化之速度成反比， 其決定資料率。CET-值較佳為低於45 ns，為對應八倍CD 速度之線性速度9.6 m/s所必需，或甚至低於35 ns ,為對應 12倍CD-速度之線性速度14.4 m/s所必需。媒體之跳動應為 一低而為常數位準。使用本發明之光學記錄媒體甚為優異 ，因為晶態化速率足夠快，以使至少此記錄速度不致增加 跳動，因為非晶態記號直徑之變化所致。 複合物QRX之光吸收層之存在，可確保實質上在波長自 3 5 0-450 nm範圍時，Ac等於或大於Aa。此可經由改變χ而準 確調伯。例如kx = 4G() nm，此為複合物在波長々(JO nm時之 複折射係數β之虛數部份，實質上為變數乂平滑函數。當χ = 〇 本紙張尺度適用中國國家標準(CNS) Α4規格(210 X 297公釐) 554341 A7 B7 五、發明説明（5 ) ，k^4〇〇 nm = 2.66，當 X=1，kh4()() nm=〇.17。變數k為複合物 中雷射光吸收之直接量度。因此，此複合物可適於用以作 為可調諧光吸收層。光吸收層之適當吸收，為達到 0.8<AC/Aa<l .50，可改變Si中〇之分數而達成。特別是， ^λ=400 nm 對X之可預測及連續依存性，在製造能力之觀點言 是有益的。結果，可選擇一最佳光吸收層，在晶態區寫入 之記號實質上具有與非晶態區再寫入之記號尺寸相同。 此一效應可降低跳動，此一記錄媒體之儲存密度，可大 幅改善。k為X之函數之依存性，當波長非4〇〇 nm，但仍在 350-450 nm範圍時，此依存性相似。即使當Ac及心實質上 相等’讀出光學資訊媒體之光學對比C，必須保持甚高。光 學對比C之定義為i〇〇(Rc_Ra)/R(：，其中Rc&Ra為媒體分別 在晶恶及非晶態中之反射率。高光學對比可由堆疊之光學 設計而達成。 一較南資料率在Ac〉Aa時可以獲得。此時，當記錄層由具 有固定脈波期間或停留時間輻射時，記錄層之晶態部份可 加熱至較非晶態記號為高之溫度。因擦拭一非晶態記號， 溫度必須為持在高於晶態化時間八一段時間，其至少為 CET值。目為晶態背景獲得一較待擦拭之非晶態記號為高 之概度熱將擴政至5己號，結果，記號以較低速度冷卻， 當仍保持高於Τχ—長時間。由於緩慢之冷卻率，利用同一 停留時間，非晶態記號可停留在^以上之溫度一長時間， 等於或大於CET。利用一具有本發明之光吸收層之媒體結 構，可達成較高資料率，而不需降低CET。與此對比，堆 -8- I紙張尺度適财g a家標準(CNS) M規格(別χ 297公$ —-
線 554341 A7 _ B7 五、發明説明（6 ) 疊中之A c較A a為低’將導致冷卻結構’即，晶態背景之溫 度將較非晶態記號為低。熱將自記號擴散至晶態背景。以 相同停留時間及功率，此一期間，記號在Τχ以上之時間將 較CET為短，此時，非晶態記號未完全擦拭。 一實施例中，Q為Si或Ge，R為0。Si較佳係因其在半導 體工業中常用，而易於獲得。 一第三介電層可接近光吸收層於距離記錄層甚遠之一側 。第三介電層可防止光吸收層與出現在，與光吸收層相對 之第三介電層之一側之間之遷移。此外，其尚調諧堆疊之 冷卻率，及寫入靈敏度。再者，第三介電層尚為一保護屏 蔽，以防止環境影響，特別是在第三介電層出現在距基板 甚退之一側時為甚。雷射光可通過第一介電層或第三介電 層進入堆疊。 第三介電層之厚度較佳為2-200 nm之間，更佳為1〇-1〇〇 .nm，以便在保護功率與製造能力間有一適當之平衡。當厚 度小於2 nm時，其熱絕緣可能變低。例如，一金屬反射層 或基板可鄰近第三介電層。結果，堆疊之冷卻率增加，寫 入力率亦增加。厚度在2〇〇 nm以上時，堆疊之冷卻率變為 太低。 。己錄層包含Ge及Te之複合物，即GeTe。此相位改變材料 之優點為具有一相當高之光學對比C。 其它適於作記錄層之材料為Ge-Sb_Te , In_Se，In_Se Sb
In Sb-Te ’ Te-Ge ’ Te-Se-Sb ’ Te-Ge-Se，或 Ag-In-Sb-Te 等合金。特別有用之複合物曾由本發明人之美專利號碼 -9- 本纸張尺度適用中國國家標準(CNS) A4規格(210X297公釐) 554341 A7 B7 五、發明説明（7 5,876,822中。此等複合物顯示短完全擦栻時間（CET)，及有 一由下列公式限定之原子百分否之成分： Ge5〇xSb4〇-4〇xTe6〇-i〇x ’ 0.166<x<0.444。此等複合物位於在 三元Ge-Sb-Te相位圖中之連接複合物GeTe及Sb2Te3之線上 ’並包括化學計量複合物Ge2Sb2Te5(x=0.445)， GeSb2Te4(x=0.286)及 GeSbJeyCx:。· 166) 〇 其它有用之複合物曾揭示於本申請人之美專利號碼 6,127,049中。此等複合物有一成分，由三元相位圖Ge-Sb-Te 中之一區所限定，該區為五角形，具有以下頂點P，Q，R» S^T ：
Ge14 ,2Sb25.sTe6〇.〇 (P) Ge12. 7Sb27.3Te60>0 (Q) Ge13. 4以29.2丁亡57 4 (R) Ge15 iSb27 8Te57」 (S) Ge13.2Sb264Te604 (T); 以此等複合物，低於50 ns之CET可達成。 其他有用複合物之成分為： (GeSb2Te4)i.xTex 其中之X可滿足：0.015x^0.037。此等複合物位於連接 GeSbJe4之直接連接線上，Te在三元相位圖中，但在五角 區PQRST中。以此等複合物，低於45 ns之CET可達成。 當高至3.5%之氧加入任何以上之Ge-Sb-Te複合物時’更 -10- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) 裝 訂
線 554341 A7 ____ B7 五、發明説明（8 ) 低CET值亦可獲得。 上述之Ge-Sb-Te複合物之晶態化速度或cET值，視記錄 層之層厚度而定。CET在層厚度增加時，迅速降低。當記 錄層厚度大於25 nm時，CET與其厚度無關。在35 nm以上 時，媒體之循環性受負面影響。媒體之循環性係由光學對 比C ,在一大數目之DOW-循環，即1〇5後之相對改變測量。 在每一循環，經雷射光束加熱之再晶態化，擦拭掉舊非晶 態記號，而新非晶態記號被寫入。理想情況下，光學對比c 在循環保持不變。循環性在記錄層之層厚度為35 nm時，實 際上為常數。由於CET與循環性結合之結果，記錄層之厚 度較佳為5及35 nm，較佳在10至30 nm之間。一具有厚度10 至30 nm間之記錄層，在第一 105 D〇W-循環有一不變之低 跳動。 堆疊中可有一反射層，其至少包含一選自一組含Al、Ti
、Au、Ag、Cu、Rh、Pt、Pd、Ni、Co、Mn、Cr、Mo、W 、Hf及Ta之金屬，包括其合金。通常，此反射層，如存在 時，位於堆疊之一側，與雷射光進入之堆疊側之對面。此 吸收層在雷射光首先通過記錄層時，作為一反射層，此時 ’不需反射金屬層。但，視光資訊媒體之型別，可能需要 一反射金屬層以便獲得足夠之絕對反射，以符合其規格。 第一，第二及第三介電層可含ZnS及Si02之混合物，即 (ZnS)8〇(Si02)2〇。此層亦可含Si〇2，Ti〇2，ZnS，Si3N4，A1N 或Ta205。較佳利用碳化物，如siC，WC，TaC，ZrC或TiC 。此等材料有較高之晶態化速度，及較ZnS-Si02混合物為 -11 - 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公釐) 554341 A7 B7 五、發明説明（9 ) 佳之循環性。 如較早所提’第二介電層可阻止遷移，或以光吸收層與 記錄層間之擴散而合金化。再者，由於干擾效應，其厚度 可細調諧八。與八3之比值。厚度較佳在2及75 nm，最佳為^ 及60 nm。2 nm以上之厚度可造成裂紋，及降低循環性。大 於75 nm厚度之-層，可降低記錄層之冷卻率，及降低光吸 收層之效應。 相位改變記錄層可由真空澱積法，如電子束蒸發，化學 蒸氣澱積，離子植入或潑濺等法，加在基板上。澱積之層 為非晶態並展現低反射。為構成一具有高反射之適當記錄 層，此層首先必須完全晶態化，通常稱為初始化。為此目 的’ §己錄層可在爐中加熱至一高於Ge-Te，Ge-Te_〇，
Ge-Te-N複合物之晶態化溫度19〇度c。一種綜合樹脂基板 如聚碳酸脂，可交互以足夠功率之雷射光束加熱。此可在 一記錄器中實現，此時，雷射光束掃描移動之記錄層。非 晶態層於疋局部加熱至晶態化此層所需之溫度，而基板不 需受到不良之熱負載。 光吸收層可用潑濺法加在基板上。具有理想氧或氮含量 之潑濺目標之Si、Ge、Ti、Zr、Hf、Nb或Ta可應用，或使 用該元素之純目標，因此，可控制潑濺氣體中之氧及氮。 貫際上’潑錢氣體中氧及氮之濃度應在〇與3〇 %體積。 資訊媒體之基板包含如聚碳酸脂（PC)，甲基甲基敗脂 (PMMA)，非晶態烯族烴或玻璃。在一典型例中，基板為碟 形並具有120 mm之直徑，及厚度〇·ι，（^或丨2 mm。當利 -12- 本紙張尺度逋用中國國家標準(CNS) A4規格(210 X 297公釐） •裝 訂
線 554341 A7 B7 一 丨…· ........ - _ _ 五、發明説明（10 ) 用0.6或1.2mm基板時，各層可加在此基板上並由第一介電 層開始。如雷射光經基板進入該堆疊，該基板必需至少與 雷射光波長為透明。在基板上之堆疊層亦可以相反次序加 上，即，由第二介電層開始，此時，雷射光束將不經基板 進入堆疊。選擇性，最外之透明層可最為蓋層加在堆疊上 ，該層可保護其下之各層不受環境影響。此層可含一上述 基板材料或透明樹脂，例如，一 UV光凝固之厚度約〇. 1 mm 之甲基敗脂組成。如雷射光束經透明層之入口面進入堆疊 ，基板可為不透明。 光資訊媒體在記錄層之一側之基板表面，較佳提供以祠 服磁道，該磁道可由雷射光束作光掃描。此伺服磁道通常 由螺旋形槽溝’以便在注入模造或壓縮期間在基板上形成 。此槽溝亦可在一綜合樹脂層中以複製程序構成，如UV光 凝固丙烯酸層，其單獨加在基板上。在高密度記錄中，該 槽溝具有節距0.5-0.8 μιη及寬度約為節距之半。 本發明之光學資訊媒體，將以範例實施例及參考伴隨圖 式予以詳細說明，其中： 圖1顯示具有ΜΙΡΙΑΙ結構堆疊之光學資訊媒體之剖面圖。 實施例 圖1中，光學資訊媒體（20)，以雷射光束（1〇)供可擦拭之 記錄，媒體有一基板（1)及備於其上之各層堆疊（2)。堆疊（2) 有一記錄層（5)，記錄層可在非晶態及晶態間改變。記錄層 (5)插在第一介電層（4)與第二介電層（6)之間。 第一與第一介電層（4’ 6)由（ZnS)80(SiO2)20構成，其厚度 -13 - 本紙張尺度―中a g家標準(CNS) A4規格(21Q x 297公爱） --- 554341 A7 B7_ 五、發明説明（11 ) 分別為20 nm及49 nm。 一光吸收層（7)接近記錄層（5)，其厚度為20 nm。光吸收 層（7)包含公式SiOQ7之複合物。在雷射光波長405 nm時， 其可滿SAc/Aa = 〇.85。無此光吸收層（7)存在時，Ae/Aa = 0.71 ，導致大幅記錄記號失真。 一第三介電層（8)接近光吸收層（7)，在遠離記錄層（5)之 一側。第三介電層（8)之厚度為55 nm。記錄層（5)為GeTe所 製。 A1之反射層（3)出現在堆疊中，並有100 nm之厚度。在此 堆疊中，在雷射光波長405 nm之下，非晶態反射Ra=4%， 及晶態反射為Rc= 14%。 基板1為聚碳酸脂碟形基板，其直徑為120 nm，厚度為0.6 mm ° 一選擇性蓋層（9)由1^凝固樹脂0&丨(：1^30415所製，厚 .度100 μιη，出現於接近第三介電層。 根據本發明，備有一高密度可擦拭記錄之光學資訊媒體 ’如DVR-藍，具有一光吸收層接近相位改變材料之記錄層 。光吸收層之雷射光吸收，可在其製造期間，改變其〇或Ν 之含$而易於έ周谐。為達成〇.8<Ac/Aa<1.50，其中Ac及Aa 為在非晶態及晶態之記錄層中，在雷射光波長為350-450 nm之下，吸收之雷射光之量。因此，高資料率及高記錄速 度，在該波長範圍可以獲得。 -14- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) 訂
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Claims (1)

  1. 554341 A8 B8 C8 D8 第090126580號專利申請案 中文申請專利範圍替換本(92年2月） 、申請專利範圍 1· 一種光學資訊媒體（20)，以具有一雷射光波長之雷射光 束（10)方式，供可擦拭記錄之用，該媒體（20)有一基板（1) 及在其上之堆疊層（2)，堆疊（2)包含： -一記錄層（5)，其可在非晶態與晶態間改變，該記錄層 (5)插在第一介電層（4)與第二介電層（6)之間；及 -一光吸收層（7)，其位於接近記錄層（5); 其特徵為該光吸收層（7)包含一公式qrx2複合物，其中q 為選自含Si、Ge、Ti、Zr、Hf、Nb及Ta之一組，R為選 自0及N所組成之群組中之一元素，及〇<χ<2·5以便達到 〇.8<Ac/Aa<1.50，其中，Ac&Aa為在晶態及非晶態之記錄 層（5)中在選自雷射光波長350-450 nm時所吸收之雷射光 量。 2·如申請專利範圍第1項之光學資訊媒體（20),其特徵為Q 係選自Si及Ge所組成之群組中之一元素。 3·如申請專利範圍第1或2項之光學資訊媒體（2〇),其特徵為 R為元素0。 4·如申請專利範圍第1項之光學資·訊媒體（20),其特徵為雷 射波長選自375-425 nm之範圍。 5·如申請專利範圍第1項之光學資訊媒體（20),其特徵為第 三介電層（8)出現在接近光吸收層（7)附近，在距記錄層 (5)甚遠之一側。 6.如申請專利範圍第5項之光學資訊媒體（2〇),其特徵為該 第三介電層（7)之厚度為2及200 nm之間。 7·如申請專利範圍第1或5項之光學資訊媒體（2〇),其特徵
    554341
    為記錄層（5)包含Ge及Te之複合物。 8·如申請專利範圍第1或5項之光學資訊媒體(20)，其特徵 為記錄層（5)包含Ge、Sb及Te複合物。 9·如申請專利範圍第丨或5項之光學資訊媒體㈨其特徵 為反射層（3)位於堆疊内，包含選自a卜丁卜Au、Ag、Cu 、Rh、Pt、Pd、Ni、Co、Μη、Cr、Mo、W、Hf、Ta所 組成之群中之至少一金屬，包括其合金。 10. 一種光學資訊媒體（20)，以具有一雷射光波長之雷射光 束（10)方式，供可高速記錄之用，該媒體（20)有一基板（1) 及在其上之堆疊層（2)，堆疊（2)包含·· 訂
    -一記錄層（5)，其可在非晶態與晶態間改變，該記錄層 (5)插在第一介電層（4)與第二介電層之間；及 •一光吸收層（7)，其位於接近記錄層;其特徵為該光 吸收層（7)包含一公式qRx之複合物，其中Q為選自含 Si、Ge、Ti、Zi:、Hf、Nb及 Ta之一組，R為選自 Ο及 N 所組成之群組中之一元素，及〇<x<2.5以便達到 0.8<AC/Aa<1.50，其中，八。及八3為在晶態及非晶態之記 錄層（5)中在選自雷射光波長350-450 nm時所吸收之 雷射光量，其中在雷射光束及媒體間之相對速度至少 7·2 m/s 〇 -2- 本紙張尺度適用中國國家揉準(CNS) A4規格(210 x 297公釐)
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