MO Bias field coil Recorded marks Track pitch

MOドライブの光ヘッド Bias field coil Recorded marks Track pitch Focusing lens MO film Rotation of polarization Beam splitter lens mirror Laser diode PBS (polarizing beam splitter) Half wave-plate Photo-detector

FeのL 3吸収端のXMCDを用いて 観測したMO媒体の磁区像 Si. N(70 nm)/ Tb. Fe. Co(50 nm)/Si. N(20 nm)/ Al(30 nm)/Si. N(20 nm) MO 媒体 N. Takagi, H. Ishida, A. Yamaguchi, H. Noguchi, M. Kume, S. Tsunashima, M. Kumazawa, and P. Fischer: Digest Joint MORIS/APDSC 2000, Nagoya, October 30 -November 2, 2000, We. G-05, p. 114. XMCD: X線磁気円二色性

交換結合膜 Hext 1 st layer AF 2 nd layer Wall 2 nd layer (a)A-type (b)A-type Hext 1 st layer F Domain wall 2 nd layer (a)P-type Wall 2 nd layer P-type

LIMDOW　（オーバライト） Laser beam PL PL Laser beam PH Bias field (↓) PH Cooling process

Sony packs more into mini-discs Thursday, 8 January, 2004 By Alfred Hermida BBC News Online technology editor in Las Vegas Sony has learnt from others that use hard drives or memory cards Sony has packed a lot more into its mini-disc digital music players. ¡ The Japanese electronics giant has developed a new format which can store up to 45 hours of music on a single disc, as well as pictures and text. ¡ The new Hi-MD players and discs will be available from April, Sony said at the Consumer Electronics Show in Las Vegas. ¡ The mini-disc walkman has been facing tough competition from portable MP 3 players, like Apple's i. Pod, which holds up to 10, 000 songs on a hard drive. ¡ "With Hi-MD players, we're giving music lovers more choices, " said Todd Schrader, Vice President of Marketing for Sony Electronics' portable music range. "Nothing's been left out. "

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

短波長化 ¡ DVD-ROM: 405 nmのレーザを用い、track pitch =0. 26 m、 mark length=0. 213 mのdisk(容量 25 GB)を NA=0. 85のレンズ を用いて再生することに成功 [i]。 [i] M. Katsumura, et al. : Digest ISOM 2000, Sept. 5 -9, 2000, Chitose, p. 18. ¡ DVD-RW: 405 nmのレーザを用い、 track pitch=0. 34 m、 mark length=0. 29 m、層間間隔 35 mの２層ディスク(容量 27 GB)のNA=0. 65のレンズで記録再生を行い、33 Mbpsの転 送レートを達成[ii] 。 [ii] T. Akiyama, M. Uno, H. Kitaura, K. Narumi, K. Nishiuchi and N. Yamada: Digest ISOM 2000, Sept. 5 -9, 2000, Chitose, p. 116.

青紫レーザとSILによる記録再生 ＳＩＬヘッド 青紫色レーザ NA=1. 5 405 nm 80 nm mark 40 GB I. Ichimura et. al. (Sony), ISOM 2000 Fr. M 01

熱磁気記録/磁束検出法 Magnetic coil for recording GMR element for reading LD, PD Slider MO recording film Arm 助田による