Magnetic core element for antenna, thin-film antenna, and card equipped with thin-film antenna
First Claim
Patent Images
1. A magnetic core element in the form of an amorphous alloy strip of a thickness of 25 μ
- m or less having a chemical composition representation by;
space="preserve" listing-type="equation">(Co.sub.1-a Fe.sub.a).sub.100-b-c-d-e T.sub.b Si.sub.c B.sub.d Y.sub.e(
1)where T is at least one element selected from the group consisting of Mn, Ni, Ti, Zr, Hf, Cr, Mo, Nb, W, Ta, Cu, Ru, Rh, Pd, Os, Ir, Pt, Re and Sn;
Y is at least one element selected from the group consisting of C, Ge, Ga, P and Al;
a is a numerical value satisfying 0≦
a≦
0.1; and
b, c, d and e are atomic percentages each satisfying 0≦
b≦
15, 0≦
c≦
20, 5≦
d≦
25, 0≦
e≦
20 and 15≦
c+d≦
30, said magnetic core element being provided with an induced magnetic anisotropy in the width direction or in the thickness direction of said magnetic core.
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Abstract
A magnetic core element for use in a thin antenna. The magnetic core element has a thickness of 25 μm or less and is made of a particular amorphous alloy strip or a particular nano-crystalline alloy strip. A thin antenna having a laminated magnetic core made of the magnetic core elements is highly resistant to deformation and has a high Q-value.
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Citations
13 Claims
-
1. A magnetic core element in the form of an amorphous alloy strip of a thickness of 25 μ
- m or less having a chemical composition representation by;
space="preserve" listing-type="equation">(Co.sub.1-a Fe.sub.a).sub.100-b-c-d-e T.sub.b Si.sub.c B.sub.d Y.sub.e(
1)where T is at least one element selected from the group consisting of Mn, Ni, Ti, Zr, Hf, Cr, Mo, Nb, W, Ta, Cu, Ru, Rh, Pd, Os, Ir, Pt, Re and Sn;
Y is at least one element selected from the group consisting of C, Ge, Ga, P and Al;
a is a numerical value satisfying 0≦
a≦
0.1; and
b, c, d and e are atomic percentages each satisfying 0≦
b≦
15, 0≦
c≦
20, 5≦
d≦
25, 0≦
e≦
20 and 15≦
c+d≦
30, said magnetic core element being provided with an induced magnetic anisotropy in the width direction or in the thickness direction of said magnetic core. - View Dependent Claims (4)
- m or less having a chemical composition representation by;
-
2. A magnetic core element in the form of an nano-crystalline alloy strip of a thickness of 25 μ
- m or less having a chemical composition represented by;
space="preserve" listing-type="equation">(Fe.sub.1-v M.sub.v).sub.100-x-y-z-w A.sub.x M'"'"'.sub.y M".sub.z X.sub.w(
2)wherein M is Co, Ni or a combination thereof;
A is Cu, Au or a combination thereof;
M'"'"' is at least one element selected from the group consisting of Ti, V, Zr, Nb, Mo, Hf, Ta and W;
M" is at least one element selected from the group consisting of Cr, Mn, Al, Sn, Zn, Ag, In, platinum group elements, Mg, Ca, Sr, Y, rare earth elements, N, O and S;
X is at least one element selected from the group consisting of B, Si, C, Ge, Ga and P;
v is a numerical value satisfying 0≦
v≦
0.5; and
x, y, z and w are atomic percentages each satisfying 0≦
x≦
10, 0.1≦
y≦
20, 0≦
z≦
20 and 2≦
w≦
30, at least 50% of the alloy structure comprising crystal grains of an average grain size of 100 nm or less. - View Dependent Claims (3, 5)
- m or less having a chemical composition represented by;
-
6. A thin antenna comprising a laminated magnetic core and at least one coil wound around said laminated magnetic core and having a Q-value of 25 or more at 134 kHz, said laminated magnetic core having a thickness of 3 mm or less and being composed of a plurality of magnetic core elements in the form of amorphous alloy strips of a thickness of 25 μ
- m or less having a chemical composition represented by;
space="preserve" listing-type="equation">(CO.sub.1-a Fe.sub.a).sub.100-b-c-d-e T.sub.b Si.sub.c B.sub.d Y.sub.c(
1)wherein T is at least one element selected from the group consisting of Mn, Ni, Ti, Zr, Hf, Cr, Mo, Nb, W, Ta, Cu, Ru, Rh, Pd, Os, Ir, Pt, Re and Sn;
Y is at least one element selected from the group consisting of C, Ge, Ga, P and Al;
a is a numerical value satisfying 0≦
a≦
0.1; and
b, c, d and e are atomic percentages each satisfying 0≦
b≦
15, 0≦
c≦
20, 5≦
d≦
25, 0≦
e≦
20 and 15≦
v+d≦
30, said magnetic core element being provided with an induced magnetic anisotropy in the width direction or in the thickness direction of said magnetic core. - View Dependent Claims (8, 9, 10, 11, 12, 13)
- m or less having a chemical composition represented by;
-
7. A thin antenna comprising a laminated magnetic core and at least one coil wound around said laminated magnetic core and having a Q-value of 25 or more at 134 kHz, said laminated magnetic core having a thickness of 3 mm or less and being composed of a plurality of nano-crystalline alloy strips of a thickness of 25 μ
- m or less having a chemical composition represented by;
space="preserve" listing-type="equation">(Fe.sub.1-v M.sub.v).sub.100-x-y-z-w A.sub.xM'"'"'.sub.y M".sub.z X.sub.w(
2)wherein M is Co, Ni or a combination thereof;
A is Cu, Au or a combination thereof;
M'"'"' is at least one element selected from the group consisting of Ti, V, Zr, Nb, Mo, Hf, Ta and W;
M" is at least one element selected from the group consisting of Cr, Mn, Al, Sn, Zn, Ag, In, platinum group elements, Mg, Ca, Sr, Y, rare earth elements, N, O and S;
X is at least one element selected from the group consisting of B, Si, C, Ge, Ga and P;
v is a numerical value satisfying 0≦
v≦
0.5; and
x, y, z and w are atomic percentages each satisfying 0≦
x≦
10, 0.1≦
y≦
20, 0≦
z≦
20 and 2≦
w≦
30, at least 50% of the alloy structure comprising crystal grains of an average grain size of 100 nm or less.
- m or less having a chemical composition represented by;
Specification