information storage and spintronics 07ah566/lectures/info07_optical.pdf · magneto optical...

Department of Electronic Engineering

Information Storage and Spintronics07

Atsufumi Hirohata

15:00 Monday, 28/October/2019 (J/P 005)

Quick Review over the Last LectureShingled write recording : * Bit patterned media (BPM) : **

Discrete tracks : ***

*** http://www.tdk.co.jp/** http://news.cnet.com/2300-1008_3-6108692.html;

Conventional BPM Discrete tracks for BPM

Nano-holes Nano-holes Tracks

* S. Matsuo, H. Uwazumi and N. Hara, Fujidenki Gihou 85, 316 (2012);

Conventional recording

07 Optical Storages

• Read-only

•Writable

• High density

• Physical phenomena

• Phase change

Optical StorageRead-only : *

* https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwiQpNDA-__jAhVFoVwKHWGIDssQFjAAegQIARAC&url=http%3A%2F%2Fhome.sato-

gallery.com%2Feducation%2Fkouza%2FRyukoku_lecture.ppt&usg=AOvVaw0UTNH3qZH_LSTZ0vsF3Hxx/

Writable (once only) :

Writable (multiple) :

High density :

Properties of Optical StorageAdvantages of optical storage : *



RemovableLarge capacity

High density

Random accessFidelity

Not as high as HDD

Not as fast as HDDNot as good as HDD

HDD

Optical

Magneto-optical

Physical Phenomena UsedVarious phenomena are used for optical storage : *

Recording bit formation – CD-ROM, DVD-ROMChemical reaction of organic dye – CD-R, DVD-R

Amorphous phase change - CD-RW, DVD-RAM, DVD-RW, DVD+RW



Ferromagnetic-paramagnetic phase change – MO, MDPhotorefractive effect – Holographic memory

Amorphous Phase ChangeAdditional writing process : *

Rapid quenching of chalcogenide glass in an amorphous phase.Laser heating promotes crystallisation ® reflection.



Rewriting process :Initial crystallised phase by slow quenching below T < 400ºC.

Written phase by rapid quenching above T > 600ºC.DVD-RAM – GeSbTe (> 100,000 times writing cycles).DVD-RW – AgInTe (> 1,000 times writing process).Slow data transfer speed (11 ~ 47 Mbps).

Initial crystallised phase Written amorphous phase

R:大R:小Writing

Erasing

Laser spot

Written data bits



Phase Change ProcessesInitialisation and writing processes : *

Magneto-Optical StorageWriting process : *

Laser-induced heating to promote magnetic phase change above the Curie temperature.

Detection of the polarisation rotation through the Faraday effect.



Reading process :

TbFeCo (> 10,000,000 times writing cycles).

Magneto-Optical DiscIn 1971, Honeywell proposed magneto-optical recording : *

* http://ffden-2.phys.uaf.edu/211.fall2000.web.projects/J%20Kugler/mo.html

Faraday Effect

* http://www.wikipedia.org/

Rotation of a linearly polarised direction by a magnetic moment : *

Comparison among Optical Storage

* http://www.wikipedia.org/

Name Capacity Experimental[Note 1] Years[Note 2]LaserDisc (LD) 0.3 GB 1971–2001Write Once Read Many Disk (WORM) 0.2–6.0 GB 1979–1984Compact Disc (CD) 0.7–0.9 GB 1982–todayElectron Trapping Optical Memory (ETOM) 6.0–12.0 GB 1987–1996MiniDisc (MD) 0.14 GB 1989–todayMagneto Optical Disc (MOD) 0.1–16.7 GB 1990–presentDigital Versatile Disc (DVD) 4.7–17 GB 1995–presentLIMDOW (Laser Intensity Modulation Direct OverWrite) 2.6 GB 10 GB 1996–presentGD-ROM 1.2 GB 1997–presentFluorescent Multilayer Disc 50–140 GB 1998-2003Versatile Multilayer Disc (VMD) 5–20 GB 100 GB 1999-2010Hyper CD-ROM 1 PB 100 EB 1999?-?Ultra Density Optical (UDO) 30–60 GB 2000-presentFVD (FVD) 5.4–15 GB 2001-presentEnhanced Versatile Disc (EVD) DVD 2002-2004HD DVD 15–51 GB 1 TB[citation needed] 2002-2008

Blu-ray Disc (BD)25 GB50 GB100GB (BDXL)128 GB (BDXL)

1 TB 2002-present

Professional Disc for Data (PDD) 23 GB 2003-2006Professional Disc 23–128 GB 2003–presentDigital Multilayer Disk 22-32 GB 2004–2007Multiplexed Optical Data Storage (MODS-Disc) 250 GB–1 TB 2004–presentUniversal Media Disc (UMD) 0.9–1.8 GB 2004–2014Holographic Versatile Disc (HVD) 6.0 TB 2004–presentProtein-coated Disc (PCD) 50 TB 2005–present

M-DISC4.7 GB (DVD format)25 GB (Blu-ray format)50 GB (Blu-ray format)100 GB (BDXL format) [19]

2009–today

Archival Disc 0.3-1 TB 2014–present

Ultra HD Blu-ray50 GB66 GB100 GB

2015–present

https://en.wikipedia.org/wiki/Optical_dischttps://en.wikipedia.org/wiki/Optical_dischttps://en.wikipedia.org/wiki/LaserDischttps://en.wikipedia.org/wiki/Write_Once_Read_Many_Diskhttps://en.wikipedia.org/wiki/Compact_Dischttps://en.wikipedia.org/w/index.php?title=Electron_Trapping_Optical_Memory&action=edit&redlink=1https://en.wikipedia.org/wiki/MiniDischttps://en.wikipedia.org/wiki/Magneto-optical_drivehttps://en.wikipedia.org/wiki/DVDhttps://en.wikipedia.org/wiki/LIMDOWhttps://en.wikipedia.org/wiki/GD-ROMhttps://en.wikipedia.org/wiki/Fluorescent_Multilayer_Dischttps://en.wikipedia.org/wiki/Versatile_Multilayer_Dischttps://en.wikipedia.org/wiki/Hyper_CD-ROMhttps://en.wikipedia.org/wiki/Ultra_Density_Opticalhttps://en.wikipedia.org/wiki/Forward_Versatile_Dischttps://en.wikipedia.org/wiki/Enhanced_Versatile_Dischttps://en.wikipedia.org/wiki/HD_DVDhttps://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttps://en.wikipedia.org/wiki/Blu-ray_Dischttps://en.wikipedia.org/wiki/Blu-rayhttps://en.wikipedia.org/wiki/Blu-rayhttps://en.wikipedia.org/wiki/Professional_Disc_for_Datahttps://en.wikipedia.org/wiki/Professional_Dischttps://en.wikipedia.org/wiki/Digital_Multilayer_Diskhttps://en.wikipedia.org/wiki/Multiplexed_Optical_Data_Storagehttps://en.wikipedia.org/wiki/Universal_Media_Dischttps://en.wikipedia.org/wiki/Holographic_Versatile_Dischttps://en.wikipedia.org/wiki/M-DISChttps://en.wikipedia.org/wiki/Blu-rayhttps://en.wikipedia.org/wiki/Optical_dischttps://en.wikipedia.org/wiki/Archival_Dischttps://en.wikipedia.org/wiki/Ultra_HD_Blu-ray

Bit Size ComparisonData bits used for optical storage : *

* http://www.Wikipedia.org/

Holographic StorageHolographic storage has been proposed : *

* https://www.pctechguide.com/removable-storage/holographic-data-storage

Three-Dimensional Optical Storage3D optical storage : *

* M. Gu et al., Light: Sci. Appl. 3, e177 (2014).

information storage and spintronics 07ah566/lectures/info07_optical.pdf · magneto optical...

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