Electric field ferromagnetic resonance excitation method and magnetic function element employing same

A spin wave signal generation element comprising:

• a laminate structure in which an ultrathin ferromagnetic layer sufficiently thin so that an electric field shield effect by conduction electrons does not occur and a magnetic anisotropy control layer are directly stacked on each other, and an insulation barrier layer and an electrode layer are arranged in sequence on the ultrathin ferromagnetic layer side;
• means for applying a magnetic field having a specific magnetic field application angle and magnetic field strength, to the laminate structure;
• and
• means for applying an electric field having a high-frequency component of a magnetic resonance frequency, between the magnetic anisotropy control layer and the electrode layer,
• wherein a spin wave locally generated by exciting ferromagnetic resonance in the ultrathin ferromagnetic layer is extracted from at least one spin wave guide formed continuously with the ultrathin ferromagnetic layer or the magnetic anisotropy control layer.

A spin current signal generation element comprising:

• a laminate structure in which an ultrathin ferromagnetic layer sufficiently thin so that an electric field shield effect by conduction electrons does not occur and a magnetic anisotropy control layer are directly stacked on each other, and an insulation barrier layer and an electrode layer are arranged in sequence on the ultrathin ferromagnetic layer side;
• means for applying a magnetic field having a specific magnetic field application angle and magnetic field strength, to the laminate structure;
• and
• means for applying an electric field having a high-frequency component of a magnetic resonance frequency, between the magnetic anisotropy control layer and the electrode layer,
• wherein a pure spin current locally generated by exciting ferromagnetic resonance in the ultrathin ferromagnetic layer is generated in the magnetic anisotropy control layer, and the magnetic anisotropy control layer serves as a spin current transmission path.

A high-frequency detection element comprising:

• a laminate structure in which an ultrathin ferromagnetic layer sufficiently thin so that electric field shield effect by conduction electrons does not occur and a magnetic anisotropy control layer are directly stacked on each other, and an insulation barrier layer and an electrode layer composed of a ferromagnetic layer are arranged in sequence on the ultrathin ferromagnetic layer side;
• means for applying a magnetic field having a specific magnetic field application angle and magnetic field strength, to the laminate structure;
• and
• means for applying an electric field having a high-frequency component of a magnetic resonance frequency, between the magnetic anisotropy control layer and the electrode layer,
• wherein ferromagnetic resonance is excited by directly controlling magnetic anisotropy of the ultrathin ferromagnetic layer, and detection is performed by a dc voltage generated by combination with a tunnel magnetoresistive effect by the electrode layer composed of the ferromagnetic layer.

A magnetic recording device, comprising:

• a perpendicularly magnetized magnetic medium layer and a magnetic anisotropy control layer directly stacked on each other, the perpendicularly magnetized magnetic medium layer being composed of an ultrathin ferromagnetic layer sufficiently thin so that an electric field shield effect by conduction electrons does not occur;
• and
• a high-frequency electric field assist head arranged on the perpendicularly magnetized magnetic medium layer side via a gap that serves as an insulation barrier layer, wherein
• a magnetic field having a specific magnetic field application angle and magnetic field strength is applied by a write magnetic field head, and further ferromagnetic resonance in the perpendicular magnetic medium layer an electric field having a high-frequency component of a magnetic resonance frequency is applied between the magnetic anisotropy control layer and an electrode layer which is a tip of the high-frequency electric field assist head, thereby exciting ferromagnetic resonance in the perpendicularly magnetized magnetic medium layer, and
• an energy barrier necessary for magnetization reversal of the perpendicularly magnetized magnetic medium is seemingly reduced, thereby reducing a write magnetization reversal magnetic field.