Magnetic head
First Claim
1. A magnetic head comprising two magnetic blocks of high permeability which oppose to each other with a gap intervening therebetween, at least one of said magnetic blocks of high permeability being made of a single-crystal Mn--Zn ferrite, a {1 1 0} plane of the at least one single-crystal Mn--Zn ferrite being made substantially parallel to a principal magnetic circuit-forming plane, an angle θ
- between a <
1 0 0>
direction existent within said {1 1 0} plane and a plane forming said gap being made 5°
-40°
or 80°
-120°
, a glass being attached by fusion onto at least surfaces of the high-permeability magnetic block in the vicinities of sides of said gap, said glass having a lower contraction rate than said ferrite in a case of lowering the temperatures thereof from a glass setting temperature to a room temperature, and wherein a magnetocrystalline anisotropy constant K1 of said single-crystal Mn--Zn ferrite is -2×
104 to 1×
104 erg/cc.
1 Assignment
0 Petitions
Accused Products
Abstract
In a magnetic head a single-crystal Mn--Zn ferrite is employed as a core material, and cut-away parts in the vicinities of a gap are filled with a glass the contraction rate of which is lower than that of the ferrite. A principal magnetic circuit-forming plane of the core is brought into agreement with the {1 1 0} plane of the ferrite, while an angle θ defined between the <1 0 0> direction within the {1 1 0} plane of the ferrite and a gap forming plane is made 5°-40° or 80°-120°. The magnetic head thus constructed exhibits very favorable write and read characteristics.
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Citations
7 Claims
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1. A magnetic head comprising two magnetic blocks of high permeability which oppose to each other with a gap intervening therebetween, at least one of said magnetic blocks of high permeability being made of a single-crystal Mn--Zn ferrite, a {1 1 0} plane of the at least one single-crystal Mn--Zn ferrite being made substantially parallel to a principal magnetic circuit-forming plane, an angle θ
- between a <
1 0 0>
direction existent within said {1 1 0} plane and a plane forming said gap being made 5°
-40°
or 80°
-120°
, a glass being attached by fusion onto at least surfaces of the high-permeability magnetic block in the vicinities of sides of said gap, said glass having a lower contraction rate than said ferrite in a case of lowering the temperatures thereof from a glass setting temperature to a room temperature, and wherein a magnetocrystalline anisotropy constant K1 of said single-crystal Mn--Zn ferrite is -2×
104 to 1×
104 erg/cc. - View Dependent Claims (2, 3, 4, 5, 6)
- between a <
-
7. A magnetic head comprising two magnetic blocks of high permeability which oppose to each other with a gap intervening therebetween, at least one of said magnetic blocks of high permeability being made of a single-crystal Mn--Zn ferrite, a {1 1 0} plane of the at least one single-crystal Mn--Zn ferrite being made substantially parallel to a principal magnetic circuit-forming plane, an angle θ
- between a <
1 0 0>
direction existent within said {1 1 0} plane and a plane forming said gap being made 5°
-40°
or 80°
-120°
, a glass being attached by fusion onto at least surfaces of the high-permeability magnetic block in the vicinities of sides of said gap, said glass having a lower contraction rate than said ferrite in a case of lowering the temperatures thereof from a glass setting temperature to a room temperature to generate a tensile stress within the ferrite in the vicinity of the gap, and wherein a magnetocrystalline anisotropy constant K1 of said single-crystal Mn--Zn ferrite is -2×
104 to 1×
104 erg/cc.
- between a <
Specification