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

为了实现低功耗无线通信，研究了在Al2O3中含有大量2nm直径的铁磁纳米触点的纳米接触磁阻（NCMR）器件，该器件作为振荡器可获得1uw的高微波功率。为了提高NCMR比以实现高功率，我改进了表面粗糙度、nc的自组织过程等。结果，磁共振率为20%，是以往报道的两倍。我用这种改进的NCMR装置测量了微波频谱，获得了300 nW的高功率（是之前报道的6倍）。考虑反射系数，阻抗匹配样品可以达到1w。

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.