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-Akiyoshi 48 years January 1 / ? day Patent Office Secretary Hideto Saito 1 name of the
invention High sensitivity using magnetic anisotropy dispersion-Pressure sensitive device
Address 1015 Kamiodanaka Kamikoda Nakahara ward Kawasaki City Kanagawa Prefecture
Fujitsu Ltd. Inside the company! Tsuya ways Name Matsu, Keisuke Yamada (4 persons), Patentapplicant address Kanagawa-based in74m'4Mt "i indication 6 yen 1015 address 'name (522)
Fujitsu Ltd.' (2) drawing 1 piece (3 1) Power of Attorney '1 (4) Request for Application Form 1
copy ? Japan Patent Office ? JP 50-79 372 0 Release date 50 (1975) 6.27, request for
examination not yet filed (all four pages) Office internal reference number 635'24-6'1124-54Specification as the title of the invention-title of the invention-utilizing magnetic anisotropy
dispersion High sensitivity pressure sensitive element 14I Claimable field It has an
electrodeposited magnetic wire which is plated on a conductor wire so that the magnetic material
has uniaxial magnetic anisotropy in the circumferential direction and a word line provided on the
outer periphery A current is applied to the word line to apply a magnetic field in the axial
direction to the electrodeposited magnetic wire; uniaxial magnetic anisotropy dispersion of the
electrodeposited magnetic wire; A high sensitivity pressure sensitive element utilizing magnetic
anisotropy dispersion, wherein j111 pH is configured to obtain an output voltage corresponding
to the twist applied to the electrodeposited magnetic wire.
2, inventor
The present invention relates to a high sensitivity pressure sensitive device utilizing magnetic
anisotropy dispersion of electrodeposited magnetic wire plated as described in detail. Various
pressure-sensitive elements have been conventionally proposed as a pressure-sensitive element,
and examples thereof include resistive wires, piezoelectric elements, semi-conductors, conductor
pressure-sensitive elements, and magnetostrictive elements. Those four were all relatively low in
sensitivity. An object of the present invention is to provide a highly sensitive pressure sensitive
device utilizing magnetic anisotropy dispersion of a magnetic wire. An electrodeposition
magnetic wire plated so that the 5'-E conductor has a uniaxial magnetic anisotropy in the
circumferential direction and a word line provided on the outer periphery thereof, and current is
supplied to the coughing word line to The axial direction O magnetic field is applied to the
electrodeposited magnetic wire, and the electrodeposited magnetism] 1 [K added by the magnetic
@ 4 D magnetic anisotropy dispersion and the anisotropy caused by the torsional strain, the
inclination of the sex axis In order to obtain a corresponding output voltage, it is assumed that t
is a feature of the system, which will be described in detail below.
2, inventor
FIG. 1 is a detailed explanatory view of the present invention]] The electrodeposited magnetic
wire l is obtained by plating a nonmagnetic layer 1b such as amorphous nickel / phosphorus or
copper on a conductor wire 18 such as a copper alloy wire, EndPage: It is configured by plating a
ferromagnetic layer 1C such as sipamaroy or the like on a watt bath or the like like a normal
magnetic wire. By changing the material of the nonmagnetic layer 1h) or by changing the plating
current density, the size of the anisotropic dispersion can be controlled. Efforts have been made
to eliminate the anisotropic dispersion of magnetic wires, magnetic thin films, and films used as
ordinary storage elements, but in the present invention, this anisotropy is used. In terms of using
dispersion, it is possible to construct a completely new pressure sensitive element. In addition,
the ferromagnetic layer lc is a book plated so as to have uniaxial magnetic anisotropy, for
example, an easy magnetization direction indicated by ED. , Leo magnetic wire 'twist 7 is added 6
ии circumferential direction-5 to produce a 45 ░ Q strain ST. As a result, depending on whether
the magnetostriction of the ferromagnetic layer 16 is positive or negative, induced magnetic
anisotropy is newly generated in the direction of the strain or in the direction perpendicular
thereto. -A word line 2 is provided on the magnetic wire r, and a magnetic field generated by the
word line 2 is generated in the axial direction in proportion to the current Iw, as indicated by Hw,
for example. When no twist is applied to the magnetic wire 1, the 1 o o-magnetization inversion
curve is shown by a solid line, and the o-magnetization inversion curve is shown by a dotted line.
When a twist is applied to the magnetic wire l, the direction of the anisotropy axis is inclined in
the direction of synthesis of the first circumferential magnetic anisotropy and the anisotropy
produced by the strain, which is caused by the strain. Assuming that the induced magnetic
anisotropy is SIA, as shown in FIG. Hk indicates an anisotropic magnetic field. -Fig. 3 shows the
relationship between the left output voltage VO and the digit current 1d for performing reading
and writing in the same manner as in the magnetic magnetic line memory with the current 1w
supplied to the word ls2; The output voltage VD becomes zero when the write digit current is
zero, as indicated by a solid line when not added. A width TI'A due to anisotropic dispersion
exists between the write start current 1do and the write end current 7dl. When a twist is applied
to the magnetic wire, it changes as shown by a chain line, and the digit current 1 d is zero and
one! An output voltage VO occurs at This change is caused by the shift of the digit magnetic field
by the gradient magnetic field as shown in FIG. 2, and the figure shows the case of shifting to the
left, but in the case of shifting to the right There is also.
As can be seen from the foregoing, as K, the width of the anisotropic dispersion, i.e., as Izdl-Idol
becomes smaller, the change in output with respect to the twist applied to the magnetic wire
becomes larger. Such anisotropic dispersion can be controlled by materials and plating
conditions as described above. Since Fig. 4 is a book that supplies sinusoidal current to the word
lines and shows changes in the output voltage VO of 9 fields, 1 и 'combination, G is the current
Iw, b is the case where the twist is zero, C is formed When a magnitude twist is applied, d
indicates when an even greater twist is applied. According to the experiment, the width of the
word @Sa is bounded by 5 and the number of turns and the word current IMI are selected so that
the magnetic field of about lO'Oa can be adjusted to make the loonfg sine wave, the maximum
output voltage Vmag Is over 1 oose '. Such maximum power output can be further increased by
increasing the drive magnetic field or by increasing the frequency. FIG. 5 shows an example of
measurement of time-varying pressure, in which the pressure change is rapid, and an output with
a sufficient response speed can be obtained. Therefore, the present invention can be applied to
high-performance high-sensitivity microphones and the like, and since a few magnetic wires are
main components, there is an advantage of small size and low cost. As described above,
according to the present invention, the anisotropic dispersion is utilized, and the word current is
flowed only by combining the anisotropic dispersion corresponding to the positive and negative
of the magnetostriction due to the width distortion. An output voltage corresponding to a twist
can be obtained, and the pressure change can be detected as a twist of a magnetic wire by
connecting a ladder or the like to a pressure change in a linear direction. And, by narrowing the
width of the anisotropic dispersion, it is possible to increase the frequency of the word current 7
and to increase the output voltage against the twist, that is, the sensitivity.
4 Brief Description of the Drawings
2, inventor
FIG. 1 is a detailed explanatory view of the present invention, FIG. 2 is a magnetic EndPage:
binary inversion curve, FIG. 3 is a digit current / output voltage characteristic curve, and FIG. FIG.
6 is an explanatory diagram of voltage, FIG. 6 and FIG. 1 is a magnetic wire, 1 is a conductor
wire, 16 is a nonmagnetic layer, 1c is a ferromagnetic layer, and 2 is a word line. Patented Fujitsu
Fujitsu Inc., Inc., Inc., Attorney General, Tamaku, 5 parts (3 persons) 1 1 3 3 4 4 5 5 EndPage: 35
Inventors and Agents Other Than the Above (1) Inventor-Name Iwasa Makoto-(2) Agent EndPage:
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