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HEXAGONAL FERRITE POWDER, MAGNETIC RECORDING MEDIA AND MANUFACTURING METHOD OF HEXAGONAL FERRITE POWDER
PROBLEM TO BE SOLVED: To provide a hexagonal ferrite powder capable of manufacturing magnetic recording media capable of exhibiting excellent electromagnetic conversion property and less in reduction of regeneration output in repeated regeneration.SOLUTION: There is provided a hexagonal ferrite powder which has activation volume of 800 nmor more and less than 1200 nm, preferably 850 to 1150 nm, rare earth atom percentage content of 0.5 to 8.0 atom%, preferably 0.5 to 6.0 atom%, especially preferably 1.0 to 4.5 atom% based on 100 atom% of an iron atom, anisotropy constant Ku of 1.5×10J/mor more and rare earth atom surface part uneven distribution and is oval powder. There is provided hexagonal ferrite having the rare earth which is one or more kind selected from Y, La, Sm, Yb and Nd. There is provided magnetic recording media using the ferrite powder. there is provided a manufacturing method of the hexagonal ferrite powder.SELECTED DRAWING: Figure 1
【課題】優れた電磁変換特性を発揮することができ、かつ繰り返し再生における再生出力の低下が少ない磁気記録媒体の作製を可能とする六方晶フェライト粉末の提供。【解決手段】活性化体積が８００ｎｍ３以上１２００ｎｍ３未満、好ましくは８５０〜１１５０ｎｍ３であり、鉄原子１００原子％に対する希土類原子含有率が０．５〜８．０原子％好ましくは０．５〜６．０原子％、特に好ましくは１．０〜４．５原子％であり、異方性定数Ｋｕが１．５×１０４Ｊ／ｍ３以上であり、希土類原子表層部偏在性を有し、かつ楕円体状粉末である六方晶フェライト粉末。前記希土類がＹ、Ｌａ、Ｓｍ、Ｙｂ又はＮｄから選ばれる１種以上である六方晶フェライト。前記フェライト粉末を用いる磁気記録媒体。六方晶フェライト粉末の製造方法。【選択図】図１
HEXAGONAL FERRITE POWDER, MAGNETIC RECORDING MEDIA AND MANUFACTURING METHOD OF HEXAGONAL FERRITE POWDER
PROBLEM TO BE SOLVED: To provide a hexagonal ferrite powder capable of manufacturing magnetic recording media capable of exhibiting excellent electromagnetic conversion property and less in reduction of regeneration output in repeated regeneration.SOLUTION: There is provided a hexagonal ferrite powder which has activation volume of 800 nmor more and less than 1200 nm, preferably 850 to 1150 nm, rare earth atom percentage content of 0.5 to 8.0 atom%, preferably 0.5 to 6.0 atom%, especially preferably 1.0 to 4.5 atom% based on 100 atom% of an iron atom, anisotropy constant Ku of 1.5×10J/mor more and rare earth atom surface part uneven distribution and is oval powder. There is provided hexagonal ferrite having the rare earth which is one or more kind selected from Y, La, Sm, Yb and Nd. There is provided magnetic recording media using the ferrite powder. there is provided a manufacturing method of the hexagonal ferrite powder.SELECTED DRAWING: Figure 1
【課題】優れた電磁変換特性を発揮することができ、かつ繰り返し再生における再生出力の低下が少ない磁気記録媒体の作製を可能とする六方晶フェライト粉末の提供。【解決手段】活性化体積が８００ｎｍ３以上１２００ｎｍ３未満、好ましくは８５０〜１１５０ｎｍ３であり、鉄原子１００原子％に対する希土類原子含有率が０．５〜８．０原子％好ましくは０．５〜６．０原子％、特に好ましくは１．０〜４．５原子％であり、異方性定数Ｋｕが１．５×１０４Ｊ／ｍ３以上であり、希土類原子表層部偏在性を有し、かつ楕円体状粉末である六方晶フェライト粉末。前記希土類がＹ、Ｌａ、Ｓｍ、Ｙｂ又はＮｄから選ばれる１種以上である六方晶フェライト。前記フェライト粉末を用いる磁気記録媒体。六方晶フェライト粉末の製造方法。【選択図】図１
HEXAGONAL FERRITE POWDER, MAGNETIC RECORDING MEDIA AND MANUFACTURING METHOD OF HEXAGONAL FERRITE POWDER
六方晶フェライト粉末、磁気記録媒体および六方晶フェライト粉末の製造方法
SHIRATA MASAFUMI (Autor:in)
05.10.2017
Patent
Elektronische Ressource
Japanisch
IPC:
C01G
Verbindungen der von den Unterklassen C01D oder C01F nicht umfassten Metalle
,
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
/
C04B
Kalk
,
LIME
/
G11B
Informationsspeicherung mit Relativbewegung zwischen Aufzeichnungsträger und Wandler
,
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
/
H01F
MAGNETS
,
Magnete
| Europäisches Patentamt | 2018
Method of manufacturing hexagonal ferrite magnetic powder and its usage
| Europäisches Patentamt | 2015
| Europäisches Patentamt | 2016