Development of Spin Torque Micro wave Oscillator with Nano-Contact Magnetoresistance for tip-to-tip wireless communication

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In order to realize the low power consumption wireless communication, Nano-Contact Magnetoresistance (NCMR) device which has a lot of 2 nm diameter ferromagnetic Nano-Contacts in Al2O3 has been investigated to be obtained the high micro wave power of 1 uW as an oscillator. For the increase of NCMR ratio to achieve the high power, I improved the roughness of the surface, the self-organized process of NCs, and all that. In the result, MR ratio of 20 % (twice as high as previous report) was obtained. I measured the micro wave spectrum with this improved NCMR device, and obtained the high power of 300 nW (6 times as high as previous report). Considering the reflection coefficient, the impedance matched sample could be achieved the 1uW.