Ferromagnetic resonance device

Claim 2

A ferromagnetic resonance device comprising a YIG thin film element formed on a non-magnetic substrate, said YIG thin film element having a major surface coinciding with its (100) plane, a transmission line coupled to said YIG thin film element, and a bias magnetic field means applying a bias magnetic field perpendicular to said major surface.

Claim 3

A ferromagnetic resonance device comprising a YIG thin film element formed on a non-magnetic substrate, said YIG thin film element having a major surface coinciding with its (111) plane and having a uniaxial magnetic anisotropy constant Ku smaller than a uniaxial magnetic anisotropy of pure YIG thin film element formed on a GGG (gadolinium gallium-garnet) substrate, a transmission line coupled to said YIG thin film element, and a bias magnetic field means applying a bias magnetic field perpendicular to said major surface.

Claim 4

A ferromagnetic resonance device comprising a YIG thin film element formed on a non-magnetic substrate, said YIG thin film element having a major surface coinciding with its (111) plane and having a uniaxial magnetic anisotropy constant Ku smaller than a uniaxial magnetic anisotropy of pure YIG thin film element formed on a GGG (gadolinium gallium-garnet) substrate, a transmission line coupled to said YIG thin film element, and a bias magnetic field means applying a bias magnetic field perpendicular to said major surface.

Claim 5

A ferromagnetic resonance device according to claims 1 or 2, wherein said YIG thin film element is formed in disk shape.

Claim 6

A ferromagnetic resonance according to claim 3, wherein said YIG thin film element has an aspect ratio not larger than 5×10 -2 .

Claim 7

A ferromagnetic resonance device comprising: a non-magnetic substrate, a ferrimagnetic thin film element formed on a major surface of said non-magnetic substrate, a strip line disposed on said non-magnetic substrate and electromagnetically coupled to said ferrimagnetic thin film element, a conductive wall of ground potential facing said strip line, and spaced at a predetermined distance therefrom, an end of said strip line being connected to said conductive wall of ground potential, and bias magnetic field means applying a D.C. magnetic field to said ferrimagnetic thin film perpendicular to said major surface thereof, said ferrimagnetic thin film element being formed of YIG thin film having a major surface coinciding with its (100) plane.

Claim 8

A ferromagnetic resonance device comprising: a non-magnetic substrate, a ferrimagnetic thin film element formed on a major surface of said non-magnetic substrate, a strip line disposed on said non-magnetic substrate and electromagnetically coupled to said ferrimagnetic thin film element, a conductive wall of ground potential facing said strip line, and spaced at a predetermined distance therefrom, an end of said strip line being connected to said conductive wall of ground potential, and bias magnetic field means applying a D.C. magnetic field to said ferrimagnetic thin film perpendicular to said major surface thereof, said ferrimagnetic thin film element being formed of YIG thin film having a major surface coinciding with its (100) plane.

Claim 9

A filter device utilizing ferromagnetic resonance comprising: a non-magnetic substrate, first, and second, ferrimagnetic thin film elements formed on a major surface of said non-magnetic substrate, a first strip line electromagnetically coupled to said first ferrimagnetic thin film element, a second strip line electromagnetically coupled to said second ferrimagnetic thin film element, a conductive wall of ground potential facing each of said first and second strip lines and spaced at a predetermined distance therefrom, an end of said first strip line being connected to an input circuit, and another end of said first strip line being terminated at said conductive wall of ground potential, an end of said second strip line being connected to an output circuit, and another end of said second strip line being terminated at said conductive wall of ground potential, said first and second ferrimagnetic thin film elements being magnetically coupled with each other, and bias magnetic field means applying a D.C. bias magnetic field to said ferrimagnetic thin film perpendicular to said major surface thereof, said ferrimagnetic thin film element being formed of YIG thin film having a major surface coinciding with its (100) plane.

Claim 10

A filter device utilizing ferromagnetic resonance comprising: a non-magnetic substrate, first, and second, ferrimagnetic thin film elements formed on a major surface of said non-magnetic substrate, a first strip line electromagnetically coupled to said first ferrimagnetic thin film element, a second strip line electromagnetically coupled to said second ferrimagnetic thin film element, a conductive wall of ground potential facing each of said first and second strip lines and spaced at a predetermined distance therefrom, an end of said first strip line being connected to an input circuit, and another end of said first strip line being terminated at said conductive wall of ground potential, an end of said second strip line being connected to an output circuit, and another end of said second strip line being terminated at said conductive wall of ground potential, said first and second ferrimagnetic thin film elements being magnetically coupled with each other, and bias magnetic field means applying a D.C. bias magnetic field to said ferrimagnetic thin film perpendicular to said major surface thereof, said ferrimagnetic thin film element being formed of YIG thin film having a major surface coinciding with its (100) plane.

Claim 11

A ferromagnetic resonance device according to claims 5 or 6, which further comprises a conductive layer formed on a surface opposite to said major surface of said non-magnetic substrate.

Claim 12

A ferromagnetic resonance device comprising a non-magnetic substrate, a ferrimagnetic thin film element formed on a major surface of said non-magnetic substrate, a strip line disposed on said non-magnetic substrate and electromagnetically coupled to said ferrimagnetic thin film element, a conductive wall of ground potential facing said strip line, and spaced at a predetermined distance therefrom, an end of said strip line being connected to said conductive wall of ground potential, and bias magnetic field means applying a D.C. magnetic field to said ferrimagnetic thin film perpendicular to said major surface thereof, said ferrimagnetic thin film element being formed of YIG thin film having a major surface coinciding with its (111) plane, and having a uniaxial magnetic anisotropy constant Ku smaller than the uniaxial anisotropy constant of pure YIG thin film element formed on a GGG substrate.

Claim 13

A ferromagnetic resonance device comprising a non-magnetic substrate, a ferrimagnetic thin film element formed on a major surface of said non-magnetic substrate, a strip line disposed on said non-magnetic substrate and electromagnetically coupled to said ferrimagnetic thin film element, a conductive wall of ground potential facing said strip line, and spaced at a predetermined distance therefrom, an end of said strip line being connected to said conductive wall of ground potential, and bias magnetic field means applying a D.C. magnetic field to said ferrimagnetic thin film perpendicular to said major surface thereof, said ferrimagnetic thin film element being formed of YIG thin film having a major surface coinciding with its (111) plane, and having a uniaxial magnetic anisotropy constant Ku smaller than the uniaxial anisotropy constant of pure YIG thin film element formed on a GGG substrate.

Claim 14

A filter device utilizing ferromagnetic resonance comprising: a non-magnetic substrate, first and second, ferrimagnetic thin film elements formed on a major surface of said non-magnetic substrate, a first strip line electromagnetically coupled to said first ferrimagnetic thin film element, a second strip line electromagnetically coupled to said second ferrimagnetic thin film element, a conductive wall of ground potential facing each of said first and second strip lines and spaced at a predetermined distance therefrom, an end of said first strip line being connected to an input circuit, and another end of said first strip line being terminated at said conductive wall of ground potential, an end of said second strip line being connected to an output circuit, and another end of said second strip line being terminated at said conductive wall of ground potential, said first and second ferrimagnetic thin film elements being magnetically coupled with each other, and bias magnetic field means applying a D.C. bias magnetic field to said ferrimagnetic thin film perpendicular to said major surface thereof, said ferrimagnetic thin film element being formed of YIG thin film having a major surface coinciding with its (111) plane and having a uniaxial magnetic anisotropy constant Ku smaller than a uniaxial magnetic anisotropy constant of pure YIG thin film element formed on a GGG substrate.

Claim 15

A filter device utilizing ferromagnetic resonance comprising: a non-magnetic substrate, first and second, ferrimagnetic thin film elements formed on a major surface of said non-magnetic substrate, a first strip line electromagnetically coupled to said first ferrimagnetic thin film element, a second strip line electromagnetically coupled to said second ferrimagnetic thin film element, a conductive wall of ground potential facing each of said first and second strip lines and spaced at a predetermined distance therefrom, an end of said first strip line being connected to an input circuit, and another end of said first strip line being terminated at said conductive wall of ground potential, an end of said second strip line being connected to an output circuit, and another end of said second strip line being terminated at said conductive wall of ground potential, said first and second ferrimagnetic thin film elements being magnetically coupled with each other, and bias magnetic field means applying a D.C. bias magnetic field to said ferrimagnetic thin film perpendicular to said major surface thereof, said ferrimagnetic thin film element being formed of YIG thin film having a major surface coinciding with its (111) plane and having a uniaxial magnetic anisotropy constant Ku smaller than a uniaxial magnetic anisotropy constant of pure YIG thin film element formed on a GGG substrate.

Claim 16

A ferromagnetic resonance device according to claims 5 or 6, which further comprises a conductive layer formed on a surface opposite to said major surface of said non-magnetic substrate.

Claim 17

A filter device according to claims 6 or 9, wherein said first and second ferrimagnetic thin film elements are magnetically coupled by a transmission line.

Claim 18

A filter device according to claims 6 or 9, wherein said first and second ferrimagnetic thin film elements are magnetically coupled by a third ferrimagnetic thin film element provided between and adjacent to said first and second ferrimagnetic thin film elements.

Claim 19

A ferromagnetic resonance device comprising a YIG thin film element formed by LPE on a non-magnetic substrate, said YIG thin film element having a major surface coinciding with its (100) plane, a transmission line coupled to said YIG thin film element, and a bias magnetic field means applying a bias magnetic field perpendicular to said major surface.

Claim 20

A ferromagnetic resonance device comprising a YIG thin film element formed by LPE on a non-magnetic substrate, said YIG thin film element having a major surface coinciding with its (100) plane, a transmission line coupled to said YIG thin film element, and a bias magnetic field means applying a bias magnetic field perpendicular to said major surface.

Claim 21

A ferromagnetic resonance device comprising a YIG thin film element formed by LPE on a non-magnetic substrate, said YIG thin film element having a major surface coinciding with its (111) plane and having a uniaxial magnetic anisotropy constant Ku smaller than a uniaxial magnetic anisotropy of pure YIG thin film element formed on a GGG (gadolinium-gallium-garnet) substrate, a transmission line coupled to said YIG thin film element, and a bias magnetic field means applying a bias magnetic field perpendicular to said major surface.

Claim 22

A ferromagnetic resonance device comprising a YIG thin film element formed by LPE on a non-magnetic substrate, said YIG thin film element having a major surface coinciding with its (111) plane and having a uniaxial magnetic anisotropy constant Ku smaller than a uniaxial magnetic anisotropy of pure YIG thin film element formed on a GGG (gadolinium-gallium-garnet) substrate, a transmission line coupled to said YIG thin film element, and a bias magnetic field means applying a bias magnetic field perpendicular to said major surface.