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高密存储介质磁性纳米颗粒薄膜与纳米超晶格结构研究进展

发布时间:2008/5/28 0:00:00 访问次数:494

石礼伟,李玉国,王强,薛成山,孙海波
(山东师范大学半导体研究所,山东 济南 250014)
摘要:钴基合金和铁基合金磁性纳米颗料薄膜和纳米超晶格结构,由于具有较高的矫元力和各向异性能,较小的粒子尺寸分布和能形成“单域”结构等特性,从而成为颇有潜力的高密存储介质。最近几年,人们竞相研究其制备方法,其中主要包括真空淀积法、液相化学合成法和离子注入法等,采用各种措施来提高存储介质的热稳定性和其他磁学性能,并取得巨大进展。

关键词:磁性纳米颗粒薄膜;纳米超晶格结构;高密存储介质;热稳定性;磁学性能

1 introduction

magnetic recording has made rapid progress since ibm built the first magnetic hard disk drive(hdd)in 1956,featuring a total storage capacity of 5 mb at a recording density of only 2 kb/in2[1]. magnetic recording wavelength has reduced from primary 1000 μm to current submicrometer length scales[2]. the areal density(da)has increased more than 20 millionfold in modern disk drives and currently almost doubles per annum[1]. nonetheless,21 century being an information century,there are various kinds of information to be processed,transported,and stored,largecapacitystorage technique becomes more and more important and the pursuit of higher areal densities still continues. in order to develop substrates,recording media,gmr(giant magneto resistance)playback heads and recording techniques in the future for recording medium with da of beyond 40 gb/in2,nsic(national storage industry consortium)and src(storage research consortium)organizations were established in america in 1991 and in japan in 1995,respectively[2]. extremely highdensity recording(ehdr)with da beyond 100 gb/in2,even 1 tb/in2 is expected in a few years[1,3]. however,continued growth in density gives rise to socalled“superparamagnetic effect”,which influences the thermal stability of recording systems. therefore,recent studies mainly focus on taking various measures or methods to fabricate recording media for extremely highdensity data storage and to improve the areal density and the thermal stability of these recording media. in this article,we will look into the distance of the progress on magnetic recording from the aspect of recording media.

2 ferromagnetic nanoparticles

isolated ferromagnetic nanoparticles may stand for the future of ultra highdensity magn

石礼伟,李玉国,王强,薛成山,孙海波
(山东师范大学半导体研究所,山东 济南 250014)
摘要:钴基合金和铁基合金磁性纳米颗料薄膜和纳米超晶格结构,由于具有较高的矫元力和各向异性能,较小的粒子尺寸分布和能形成“单域”结构等特性,从而成为颇有潜力的高密存储介质。最近几年,人们竞相研究其制备方法,其中主要包括真空淀积法、液相化学合成法和离子注入法等,采用各种措施来提高存储介质的热稳定性和其他磁学性能,并取得巨大进展。

关键词:磁性纳米颗粒薄膜;纳米超晶格结构;高密存储介质;热稳定性;磁学性能

1 introduction

magnetic recording has made rapid progress since ibm built the first magnetic hard disk drive(hdd)in 1956,featuring a total storage capacity of 5 mb at a recording density of only 2 kb/in2[1]. magnetic recording wavelength has reduced from primary 1000 μm to current submicrometer length scales[2]. the areal density(da)has increased more than 20 millionfold in modern disk drives and currently almost doubles per annum[1]. nonetheless,21 century being an information century,there are various kinds of information to be processed,transported,and stored,largecapacitystorage technique becomes more and more important and the pursuit of higher areal densities still continues. in order to develop substrates,recording media,gmr(giant magneto resistance)playback heads and recording techniques in the future for recording medium with da of beyond 40 gb/in2,nsic(national storage industry consortium)and src(storage research consortium)organizations were established in america in 1991 and in japan in 1995,respectively[2]. extremely highdensity recording(ehdr)with da beyond 100 gb/in2,even 1 tb/in2 is expected in a few years[1,3]. however,continued growth in density gives rise to socalled“superparamagnetic effect”,which influences the thermal stability of recording systems. therefore,recent studies mainly focus on taking various measures or methods to fabricate recording media for extremely highdensity data storage and to improve the areal density and the thermal stability of these recording media. in this article,we will look into the distance of the progress on magnetic recording from the aspect of recording media.

2 ferromagnetic nanoparticles

isolated ferromagnetic nanoparticles may stand for the future of ultra highdensity magn

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