JPH01128202A - magnetic recording device - Google Patents

Abstract

PURPOSE:To attain recording into a recording medium by adding a magnetic field in the opposite direction to initial magnetization in the initially magnetized recording medium, and concentrating magnetic fluxes to places where there are no complete diamagnetic substances by means of the complete diamagnetic substances. CONSTITUTION:For executing recording into the initially magnetized magnetic recording medium 1, superconductive materials 4 with holes in places to be recorded are provided on the magnetic recording medium 1. The uniform magnetic field is generated on the medium by electromagnets and the like. The generated magnetic fluxes do not pass through the inner part of the superconductive materials but concentrate on hole parts by the characteristics of the complete diamagnetism in the superconductive materials. The magnetic fluxes in the opposite direction (B) to the initial magnetization concentrate on the recording mediums of the hole parts, and the places to be recorded in the medium 1 can be magnetized in the direction of an arrow B and are recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to magnetic recording devices such as magnetic disks and magnetic cards, and particularly to perpendicular magnetic recording devices.

2. Description of the Related Art In recent years, magnetic recording devices such as Freonbi disks and magnetic cards have been widely used. In particular, recording devices using perpendicular magnetic recording media capable of high density are also widely used.

An example of the above-mentioned conventional magnetic recording device will be described below with reference to the drawings.

FIG. 2 shows the state of recording in a conventional perpendicular magnetic recording device. In FIG. 2, 1 is a magnetic recording medium, 2 is a recording head, 3 is a magnetic field generating coil, and 5 is a recording head moving device. The operation of the magnetic recording device configured as described above will be explained below.

When recording on a magnetic recording medium 1 that is initially magnetized in one direction (in the direction of the arrow in FIG. 2), the recording head 2 is moved to the desired recording location and a current is applied to the magnetic field generating coil 3 at that location. Directs magnetic flux to head 2 in the other direction (second
Flow in the direction of arrow B in the figure). Then, the magnetic flux concentrated portion of the magnetic recording medium 1 is magnetized in the direction of arrow B and recorded. In areas that are not to be recorded, the switch 4 turns off the current flowing through the magnetic field generating coil. This operation moves the recording head 2 to the recording head moving device 5.
By performing this while moving in the direction of arrow C, it is possible to record on all areas of the recording medium. Also,
The same effect can be obtained even if the recording head is fixed and the magnetic recording medium is moved.

Problems to be Solved by the Invention However, in the above configuration, in order to record on the recording medium, a moving device for moving the recording head relative to the magnetic recording medium using a recording head moving device or the like is required. There was a problem. There is also the problem that it takes too much time, especially when recording a large amount of data.

In view of the above problems, the present invention provides a magnetic recording device that does not require a recording head moving device for moving the recording head even when recording a large amount of data.

Means for Solving the Problems In order to solve the above problems, the magnetic recording device of the present invention includes:
a recording medium that is initially magnetized in a first direction; a magnetic field generating means that generates magnetic flux in a second direction opposite to the first direction;
The recording medium is equipped with a magnetic field blocking means having perfect diamagnetic properties and having a hole in a portion of the recording medium that is desired to be magnetized in the second direction.

Operation The present invention records on the recording medium by applying a magnetic field in the opposite direction to the initial magnetization direction to the recording medium that has been initially magnetized by the above-described configuration, and by concentrating the magnetic flux using a completely diamagnetic material in a place where there is no completely diamagnetic material. be able to.

Embodiment Hereinafter, a magnetic recording apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the state of recording in a magnetic recording device according to an embodiment of the present invention. In FIG. 1, 1 is a magnetic recording medium such as a floppy disk, 2 is a magnetic field generating means for applying a -like magnetic field to the magnetic recording medium, and 4 is a completely diamagnetic superconducting material serving as a magnetic field blocking means.

The operation of the magnetic recording apparatus configured as described above will be described below with reference to FIG.

When it is desired to record on a magnetic recording medium 1 that is initially magnetized in one direction (the direction of arrow A in FIG. 1), a superconducting material 4 with holes formed at the desired recording locations is covered over the magnetic recording medium 1. Thereafter, magnetic flux is generated using a magnetic field generating means (for example, an electromagnet) that applies a negative magnetic field to the magnetic recording medium 1. Due to the completely diamagnetic property of the superconductor material, the magnetic flux generated by the magnetic field generating means does not pass through the inside of the superconductor material, but is concentrated in the hole. Then, the recording medium in the holed area has a magnetization direction opposite to the initial magnetization direction (direction of arrow B in Figure 1).
The magnetic flux concentrates, and the portion of the magnetic recording medium 1 to be recorded is magnetized in the direction of arrow B and recorded.

As described above, according to this embodiment, a magnetic recording device that does not require a magnetic head moving device is provided by covering a superconducting material with a hole in a portion to be recorded on a magnetic recording medium and applying a magnetic field from the outside. It is something. Further, even when a large amount of recording is required, it can be recorded in a short time.

In the above examples, as the superconductor material, for example, a so-called room temperature superconductor is used, or a material whose superconducting critical temperature is between room temperature and the boiling point of liquid nitrogen is used and cooled with liquid nitrogen. Alternatively, a material with a superconducting critical temperature below the boiling point of liquid nitrogen may be used and cooled with liquid helium (not shown). An example of a room-temperature superconductor has a composition of strontium (Sr), barium (Ba), yttrium (Y), and copper (Cu).
) in a ratio of 1:1:1:3, respectively. As an example of this manufacturing method, 5rCo8. A predetermined amount of each powder of BaCo3, Y2O3, and CuO was mixed, pulverized, and heated to 92°C in air.
Bake at 0°C for 5 hours. This firing and crushing process is repeated three times to improve homogeneity. After cold compression molding the mixed powder treated in this way, it was molded in air at 1000°C for 50 minutes.
Manufactured by baking for a period of time and slowly cooling.

Effects of the Invention As described above, in the present invention, by providing a superconducting material having perfect diamagnetic properties on a magnetic recording medium, a large amount of recording can be performed in a short time using a constant external magnetic field.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a magnetic recording device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional magnetic recording device. 1...Magnetic recording medium, 2...Magnetic field generating means, 4...Superconductor material. Name of agent: Patent attorney Toshio Nakao (1 person) Figure 2

Claims (1)

[Claims] a magnetic recording medium magnetized in a first direction; a magnetic field generating means that generates magnetic flux in a second direction opposite to the first direction;
A magnetic recording device comprising a completely diamagnetic magnetic field blocking means having a hole in a portion of the recording medium that is desired to be magnetized in a second direction.