12e-11

1212

MOMD(MOMDTbit/in2HDD

d=0.6/NAdNA(numerical aperture)nNA=n sinCD-ROM: NA=0.65 CD-ROM: =780nmd=720nm DVD: =650nmd=600nm BD: NA=0.85 =405nmd=285nm HD-DVD: NA=0.65 =405nmd=373nm

CD-ROM,DVD-ROMCD-R, DVD-R(recordable)CD-RW, DVD-RAM, DVD-RW, MO, MD(rewritable)

(1)CD-ROMCD-ROM110nm1/4

CD-ROMn=1.55=780nm =503nm:110nm ~ 1/2http://www.infonet.co.jp/ueyama/ip/multimedia/cd.html

(2)CD-RCD-R

()CD-RW, DVD-RAM, DVD-RW(GeSbTe600400

(4)DVD-RW1000DVD-RAM101000

(

1962 Conger,Tomlinson 1967 Mee Fan 1971 Argard (Honeywel)MnBiMO1972 Suits(IBM)EuOMO1973 Chaudhari(IBM)GdCo1976 Sakurai()TbFe1980 Imamura(KDD)TbFeMO1981 Togami(NHK)GdCoMOTV1988 5MO(650MB)1889 3.5 MO(128MB)1991 Aratani(Sony)MSR(1992 SonyMD(1997 SanyoASMO(56GBL/G, MFM/MSR)1998 FujitsuGIGAMO(3.51.3GB)2001 SanyoiD-Photo(2, 780MB)2002 Canon-23GB2004 SonyHi-MD

MOMOMO(TbFeCo)Allandgroove

TcMs

TbFeCoGdFeCoTbFeCoGdFeCo

AmorphousamorphMOTbFeCoFeSiB)(GeSbTe)(a-Si:H)()

MOOK

(RDF)1rhttp://cmt.dur.ac.uk/sjc/thesis/thesis/node79.htmlDRPHS (dense random packing of hard spheres)

TdFeCoTMMTMRMRTMRR(NdPr)R(GdTb)

R-RR-CoRR1 R-Co

Tc Tc

() 10kOe(800kA/m) TbFeCoTc0TcTc

(R-TM)220TcompHcMs

M

FeCoTbMMs=0,MO650nmFe,Co

D1D2+-LD

()////

MO(NA0.5)6780650nm10mW13mW()PSCN23

MOLaser diodePhoto-detectorFocusing lensHalf wave-platelensBeam splitterPBS(polarizing beam splitter)Rotation ofpolarizationRecorded marksTrack pitchBias field coilMO filmmirror

(LIM)MO(MFM)MD, iD-Photo

XFeL3XMCDMOSiN(70nm)/ TbFeCo(50nm)/SiN(20nm)/Al(30nm)/SiN(20nm) MO N. Takagi, H. Ishida, A. Yamaguchi, H. Noguchi, M. Kume, S. Tsunashima, M. Kumazawa, and P. Fischer: Digest Joint MORIS/APDSC2000, Nagoya, October 30-November 2, 2000, WeG-05, p.114.

XMCD:X

1980(HDD)1990BD20Gb/in2HDD200Gb/in2MO

(MSR)GIGAMOMO=650 nm()0.3m(MSR)[1]3.5GIGAMO2.5 Gb/in2[1] M. Moribe, M. Maeda, H. Nakayama, M. Yoshida, and K. Shono: Digest ISOM01, Th-I-01, Taipei, 2001.

(MSR)

(MSR)(2)

SN(MAMMOS)(DWDD)

MAMMOSMAMMOS[1]100 Gb/in264 Gb/in2[2]MAMMOS

[1] H. Awano, S. Ohnuki, H. Shirai, and N. Ohta: Appl. Phys. Lett. 69 (1996) 4257.[2] A. Itoh, N.Ohta, T. Uchiyama, A. Takahashi, M. Mieda, N. Iketani, Y. Uchihara, M. Nakata, K. Tezuka, H. Awano, S. Imai, and K. Nakagawa: Digest MORIS/APDSC2000, Oct. 30- Nov. 2, Nagoya, p. 90.

MAMMOS( MO )

MAMMOS0

MAMMOS

DWDDDWDDMAMMOS[1]2004.1.8DWDDHi-MD(1GB) [2][1] T. Shiratori, E. Fujii, Y. Miyaoka, and Y. Hozumi: Proc. MORIS1997, J. Magn. Soc. Jpn. 22, Suppl.S2 (1997) 47.[2]204.2.2, p.28

DWDD

DWDD()

DWDD

1991Betzig[1][2][1] E. Betzig, J.K. Trautman, R. Wolfe, E.M. Gyorgy, P.L. Finn, M.H. Kryder and C.-H. Chang: Appl. Phys. Lett. 61 (1992) 1432[2] S. Hosaka, T. Shintani, M. Miyamoto, A. Hirotsume, M. Terao, M. Yoshida, K. Fujita and S. Kammer: Jpn. J. Appl. Phys. 35 (1996) 443.

SIL (solid immersion lens)SIL[1]Terris780 nmSILTbFeCo0.2 mMFM[2]SIL()1994Terris[3]2.45 Gb/in23.3 MbpsMFM()SIL2 Gmarks/in2[4]

[1] S.M. Mansfield and G. Kino: Appl. Phys. Lett. 57 (1990) 2615.[2] B. D. Terris, H.J. Maminn and D. Ruger: Appl. Phys. Lett. 68 (1996) 141.[3] B.D.Terris, H.J. Mamin, D. Ruger, W.R. Studenmund and G.S.Kino: Appl. Phys, Lett. 65 (1994) 388.[4] P. Glijer, T. Suzuki, and B. Terris: J. Magn. Soc. Jpn. 20 Suppl.S1 (1996) 297.

SIL (solid immersion lens)R. Gambino and T.Suzuki: Magneto-Optical Recording Materilas (IEEE Press, 1999)

SILNA=1.5405nm80nm mark40GBI. Ichimura et. al. (Sony), ISOM2000FrM01

SIL

/SliderLD, PDMO recording filmArmMagnetic coil for recordingGMR element for reading

H. Saga et al. DigestMORIS/APDSC2000, TuE-05, p.92.TbFeCodisk(SIL)

20nm 10%C/N20nmLD / S/N

(2)()

http://magazine.fujitsu.com/vol48-3/6.html

HPhttp://www.miragesofttech.com/ofc.htm

1.4mOH

km20Er:Erbium Doped FiberEr

HPhttp://www.agc.co.jp/news/2000/0620.html

Er980nm1480nm1530nmEDFAEr1530nmErHPhttp://www.agc.co.jp/news/2000/0620.html

(WDM=wavelength division multiplexing)14501650nm(0.3dB/km)

WDM(OADM) EDFA

(LD)LDLD

OADM(Optical Add-Drop Multiplexing) 2OADMkDropAddk

2P1P2FP1F45452()P245P2F45P1

http://www.shinkosha.com/products/optical/

3-port Optical Circulator C-band : YC-1100-155FDK

Prism polarizer AFaraday rotatorPrism polarizer BHalf wave platePort 1Port 3Port 2Port 4Reflection prism

YIG(Y3Fe5O12)YBi312Fe3+http://www.ien.it/~magni/work/garnets.pdf

YFe YRR3Fe5O12(R)YIGR3Fe5O12RBiBiBi45

YIG(CT) ()2.5eV ()2.03eV1.77eV,1.37eV,1.26eV

BiBiBiBiBi

II-VI1m II-VIIIMn-

Cd1-xMnxTe MnCd1-xMnxTeMnMn2.2eVMn2+

CdMnTeII-VIEg()Mn(sdFurdyna

DMS:GaAs GaAsMBECdMnTeZnTe, CdTe

http://ge-rd-info.denken.or.jp/ge-leaflet/pdf/T03072.pdf

11(CD-RW)(MO, MD)