公开(公告)号：JPH06232417A

公开(公告)日：1994-08-19

申请号：JP34423592

申请日：1992-12-24

Applicant: IBM

Inventor： KATOU YOSHIMINE

IPC: H01L21/265 ,  H01L21/335 ,  H01L29/06 ,  H01L29/775 ,  H01L29/80 ,  H01L29/804

Abstract: PURPOSE: To easily realize a semiconductor device containing quantum-thin line or quantum dot by growing a non-dope hetero-junction structure on a semi- insulating substrate, and implanting a pattern of dopant ions. CONSTITUTION: On an MBA device, a semi-insulating GaAs substrate 1 is set, and a non-dope GaAs channel layer 2 is grown on the substrate for growing an non-dope AlxGa1-x As layer, so that a GaAs/AlxGa1-x As hetero-junction structure is formed. The substrate 1 is moved and set in an FIB device through a vacuum transportation channel, and an n-type or P-type dopant ion beam 5 is implanted as a line or dot in a quantum-thin line or a quantum dot formation scheduled region, so that an n-type electron-supplying region 6 or p-type positive hole supplying region 6' are formed. Thus, with a thermal process for activating impurities, one-dimensional or zero-dimensional electron gas 8 is generated in the non-dope GaAs channel layer 2 to constitute a quantum-thin line, thus actualizing a device.

公开(公告)号：JPH03108144A

公开(公告)日：1991-05-08

申请号：JP24242289

申请日：1989-09-20

Applicant: IBM

Inventor： KATOU YOSHIMINE ,  SHIMIZU TERUHISA ,  TAKAYAMA SHINJI ,  TANAKA HIROSHI

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE: To attain high-density recording by laminating at least one layer each of a first magnetic layer and second magnetic layer consisting of rare earth-transition metal amorphous films on a substrate and increasing the intensity of the magnetic anisotropy in the direction perpendicular to the film plane. CONSTITUTION: This magneto-optical recording medium is formed by laminating at least one layer each of the first magnetic layer 1 and second magnetic layer 2 consisting of the rare earthtransition metal amorphous films on the substrate 3. The magnetic layer 1 is the one element selected from an element group consisting of Nd and Pr. The magnetic layer 2 contains only one element selected from an element group consisting of Tb and Dyb. The magnetic layer 1 has a high magneto-optical effect at a short wavelength and small perpendicular magnetic anisotropy. The magnetic layer is conversely small in the magnet optical effect and large in the perpendicular magnetic anisotropy. When the magnetic layers 1, 2 are laminated, the magnetic interlayer bonding effect generated between the two layers is exerted on the magnetic layer 1. The medium of the perpendicularly magnetized films having the high magneto-optical effect even at a short wavelength over the entire part of the laminated layers is then obtd. and high-density recording is made possible.