Magnon excitation and detection systems, apparatus, and methods
Magnon excitation and detection systems, apparatus, and methods are provided. The systems and apparatus may include magnon exciters and magnon detectors. The systems and apparatus are used in accordance with methods for exciting and detecting magnons.
1. A method for exciting magnetostatic spin waves in a ferromagnetic material having ferromagnetic resonance (FMR) frequencies, comprising:
providing a solenoid generating a bias magnetic field at an excitation surface of the ferromagnetic material, where the bias magnetic field is parallel to a plane formed by a surface of the ferromagnetic material; and
providing an exciter radiofrequency resonator, converting an exciter radiofrequency signal having a frequency equal to the resonant frequency of the exciter radiofrequency resonator into a pulsed oscillating magnetic field,
wherein the pulsed oscillating magnetic field is defined by a vector orthogonal to a vector defined by the bias magnetic field, and
wherein the pulsed oscillating magnetic field excites magnetostatic spin waves in the ferromagnetic material.
2. The method of claim 1 , where the bias magnetic field has an intensity that is greater than or equal to a saturation magnetic field of the ferromagnetic material.
3. The method of claim 1 , where the exciter radiofrequency resonator resonates at frequencies corresponding to the FMR frequencies of the ferromagnetic material.
4. The method of claim 1 , where the pulsed oscillating magnetic field is propagated through the ferromagnetic material.
5. The method of claim 4 , further comprising detecting the magnetostatic spin waves propagating through the ferromagnetic material, comprising:
providing a solenoid generating a bias magnetic field at a detection surface of the ferromagnetic material, where the bias magnetic field is parallel to a plane formed by a surface of the ferromagnetic material;
providing an detector radiofrequency resonator that resonates at frequencies corresponding to the FMR frequencies of the ferromagnetic material;
detecting a pulsed oscillating magnetic field coupled to the magnetostatic spin waves at the detection surface of the ferromagnetic material; and
converting the pulsed oscillating magnetic field into a detector radiofrequency signal.
6. The method of claim 5 , further comprising amplifying and reducing noise in the detector radiofrequency signal.
7. The method of claim 5 , further comprising downconverting the detector radiofrequency signal, reducing it to a frequency equal to the exciter radiofrequency signal.
8. The method of claim 5 , further comprising converting the detector radiofrequency signal into a digital signal.