 DC content control for an inverter |
| In accordance with the present invention, a control for an inverter controls DC content in the ... |
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| Switching power supply with foldback current limiting |
| What is claimed is: 1. In a switching power supply, apparatus comprising in combination: a ... |
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| Computer-controlled synthetic waveform generator |
| FIG. 1 is a schematic diagram of an energy conversion system according to the present invention. A... |
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| Inverter for converting a direct voltage into an alternating voltage |
| It is an object of the invention to provide an inverter which, using minimum circuitry, is able to ... |
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| Power converter with current-type inverter |
| Accordingly, it is an object of the present invention to provide a power converter comprising a ... |
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| DC-to-DC converters employing staggered-phase power switches with two-loop control |
| An object of this invention is to provide for N phase staggered power switches in a dc-to-dc ... |
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| Regulated power supply having a series arrangement of inverters |
| What is claimed is: 1. In an A.C.-to-D.C. regulated power supply of the type utilizing inverters in ... |
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| Inductor with centertap switching transistor for reduced radio frequency emissions |
| According to the teachings of the invention, there is taught a high power, flyback transformer ... |
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| Dual active clamp, zero voltage switching power converter |
| The present invention recognizes that the magnetizing current in the forward converter's ... |
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| Phase-difference synchronization controlling circuit of parallel switching mode power supply |
| Accordingly, it is an object of the present invention to provide a power supply in which operation ... |
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Magnetooptical recording medium and method of producing the same
| Details |
Inventors: Suzuki, Takao; Van Drent, William; Itoh, Yusuke;
Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota, JP); Toyota School Foundation (Nagoya, JP)
Primary Examiner: Kiliman; Leszek
Assistant Examiner:
Attorney, Agent or Firm: Oliff & Berridge, PLC
To obtain a magnetooptical recording medium with a magnetooptic effect suitable for ultraviolet radiation, x-layers and y-layers are sequentially laminated on a glass substrate, where x is a TbFeCo layer and y is a Pt or NdCo layer. This multilayer thin film structure can provide a hysteresis loop of a rectangular ratio 1 because a vertical magnetic anisotropic constant Ku is larger than a demagnetizing energy of 2.pi.Ms.sup.2 (where M is a saturated magnetization). FOM (Figure of Merit)=R.sqroot. [.theta..sub.k.sup.2 +.eta..sub.k.sup.2 ] where .theta..sub.k is a Kerr rotation angle and .eta..sub.k is a Kerr ellipticity) is 0.05 or more in the range of ultraviolet rays (of a wavelength of 400 nm or less). |
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DETAILED DESCRIPTION An objective of the present invention is to provide a magnetooptical recording medium which has a magnetooptic effect suitable for ultraviolet radiation.
Another objective of the invention is to provide a method of producing a magnetooptical recording medium which has a magnetooptic effect relative to ultraviolet radiation.
A magnetooptical recording medium according to the present invention may comprise a (R-TM) thin film, where R is a rare earth element of 15 to 50 by atomic % and TM is an iron group transition metal; at least 70% of R being Tb and/or Dy and the remainder of R being at least one element selected from the group consisting of Y, La, Ce, Sm, Gd, Tb, Dy, Ho, Er, and Yb; the TM being Fe and/or Co; the content of the Fe ranging 0 to 100%; the magnetooptical recording medium having a vertical magnetic anisotropic constant Ku larger than a demagnetizing field energy of 2.
pi.
Ms.
sup.
2 (where Ms is a saturation magnetization); and FOM (Figure of Merit)=R.
sqroot.
[.
theta.
.
sub.
k.
sup.
2 +.
eta.
.
sub.
k.
sup.
2 ] is 0.
05 or more in a range of ultraviolet radiation with a wavelength of 400 nm or less, where .
theta.
.
sub.
k is a Kerr rotation angle and .
eta.
.
sub.
k is a Kerr ellipticity.
Another magnetooptical recording medium according to the present invention comprises a (R-TM-M) thin film, where R is a rare earth element of 15 to 50 by atomic %, TM is an iron group transition metal and M is a metal; at least 70% of R is Tb and/or Dy, and the remainder of R being at least one element selected from the group consisting of Y, La, Ce, Sm, Gd, Tb, Dy, Ho, Er, and Yb; the TM being Fe and/or Co; the content of the Fe ranging 0 to 100%; M is at least one element selected from the group consisting of Pt, Ta, Pd, Zr, Nb, Mo, Ru, Rh, Cu, Ag, Au, and W; the magnetooptical recording medium has a vertical magnetic anisotropic constant Ku larger than a demagnetizing field energy of 2.
pi.
Ms.
sup.
2 (were Ms is a saturated magnetization); and FOM (Figure of Merit)=R.
sqroot.
[.
theta.
.
sub.
k
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Fuel Cells 
