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JPS4925157

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DESCRIPTION JPS4925157
■ Electromagnetic machine conversion element ■ Japanese Patent Application No. 40-44345
[Phase] Application No. 40 (1965) July 19 @ inventor Iga Atsushimon Shimon Shin-shi Ogata
Kamon Shin 1006 Matsushita Electric Industrial Co., Ltd. Naoki Sayase Dosho Yoshido @
Applicant Matsushita Electric Industrial Co., Ltd. Kadoma city Oji Kadoma 1006 [phase] agent
patent attorney Toshio Nakao
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a curve diagram showing the characteristics of
an electromagnetic mechanical transducer element according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an
electromagnetic mechanical transducer element material comprising a single crystal or C-plane
oriented polycrystalline body of an Fe-B based intermetallic compound. It has been known that a
ferromagnetic phase having a CuA12 structure of Fe2B exists in an Fe-B based compound, and
various studies have been reported on the magnetism of the polycrystal. For example, saturation
magnetization at an extremely low temperature is 175e, m-u / g, magnetic saturation
temperature is 1000 °, and substitution of Fe atoms with Co atoms or Ni atoms lowers both
saturation magnetization and magnetic temperature. I know that. However, the practical value of
this compound has not been studied at all. In general, the following two can be mentioned as
typical applications of conventional ferromagnetic materials. That is, one of them stores magnetic
energy using a magnet, tape material such as a tape material having a large coercive force, or
obtains work by the energy, and is generally referred to as hard magnetic material [111111]. The
other one is a magnetic core antenna such as a magnetic core antenna having a large magnetic
permeability with a coercive force ratio of a ferromagnetic material to obtain as large a
magnetization as possible with a small external magnetic field and is called a soft magnetic
material. A soft magnetic material may be used with a large external magnetic field, but in this
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case, one having a large saturation magnetization is desirable. The Fe2B polycrystal does not
have a particularly large coercive force, and does not have a particularly small coercive force.
Although the saturation magnetization is quite large, it has not been characterized in terms of
conventional applications. As a result of growing single crystals of this compound and examining
their properties, the inventors have found that the material is a material suitable for an
electromagnetic mechanical conversion element. The growth of a single crystal is carried out by
the conventional Bridgman method or zone melting method. For example, Fe powder and B
powder are mixed, compression molded and sintered in vacuum or in an inert gas to prepare
Fe2B in advance, which is grown by a Bridgman method to grow a single crystal, or by high
frequency heating If Fe2B is prepared beforehand and this is used to grow a single crystal by the
Bridgman method, a large single crystal can be easily obtained. Although a needle-like Fe phase is
likely to precipitate depending on the method of preparation, when a slight amount of B is added,
the precipitation of Fe phase can also be prevented. However, the precipitation of some Fe phase
does not cause any particular problem in the characteristics. In addition, C 2 -oriented Fe 2 B can
be easily obtained by using the zone melting method. Such a single crystal or a C-plane oriented
polycrystal has excellent characteristics when used in an electromagnetic mechanical conversion
element.
The drawing shows that when the disc-like sample cut out so that the plane of the disc contains
the C-axis of Fe2B single crystal is placed in a uniform magnetic field of 8000 elsut, the
rotational force per unit volume to which the sample passes is taken as the C-axis. It is expressed
as a function of the angle of the magnetic field. This figure is repeated with a period of 180 °.
Now, when the angle O0, that is, a uniform magnetic field is applied to the C-axis direction, the
rotational force exerted on the sample is O. When the angle slightly increases from 0 ° to
[111111] EndPage: 1, the torque rapidly increases. Also, although the angle decreases slightly
from 00, the torque increases sharply at a negative value. When the angle changes, the rotational
force also changes by approximately -2 x 10 6 b yne · C m / C m 3. Now, applying a uniform
magnetic field in the C-axis direction and superimposing a minute oscillating magnetic field
perpendicular to this, the combined magnetic field of these magnetic fields oscillates with a
minute angular amplitude centered on the C-axis direction. As a result, the sample is subjected to
a large rotational force that oscillates in the positive and negative directions. That is, a large
oscillating mechanical force can be obtained by a minute oscillating magnetic field, and it is
possible to work efficiently as an electromagnetic mechanical transducer element. The curves
shown in the drawings are generally referred to as magnetic torque curves. From the above
explanation, in this magnetic torque curve. It is understood that as steep as 0 ° (as steep as the
slope is desirable as an electromagnetic mechanical converter). Such properties are called
magnetocrystalline anisotropy. The present invention is based on the result of finding that the
Fe2B single crystal has extremely steep characteristics of this inclination. That is, Fe2B has large
magnetocrystalline anisotropy in which the C axis of tetragonal system is in the direction of
difficulty. As a result of the research, it has been found that the magnetocrystalline anisotropy
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constant exhibits a value of 3 × 10 6 erg / cm 3 at room temperature. This is a value
comparable to that of Co, but [111111] Note that although some Fe atoms of Fe2B can be
replaced by atoms such as CogNisMn, the substitution reduces the absolute value of the magnetic
anisotropy constant at room temperature It has been found. On the other hand, it was found that
the Fe2B polycrystal having C-plane orientation has the property of being magnetically close to
the Fe2B single crystal. In the case where anisotropy is required in a typical electromagnetic
mechanical transducer, it is customary to utilize shape anisotropy. In this case, the constraints
(from the shape become a configuration problem. Since magnetocrystalline anisotropy is used in
the electromagnetic mechanical conversion element of the present invention, there are few such
restrictions.
If the anisotropy of shape anisotropy is also used, the anisotropy of addition of both anisotropy
can be used. Examples of applications of such an electromagnetic mechanical converter include a
cutter for a sound recording plate, a sound recording plate side pickup, a motor rotor, and the
like.
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