Nanoscale spin rectifiers for harvesting ambient radiofrequency energy. Sharma, R., Ngo, T., Raimondo, E., Giordano, A., Igarashi, J., Jinnai, B., Zhao, S., Lei, J., Guo, Y., Finocchio, G., Fukami, S., Ohno, H., & Yang, H. Nature Electronics, 7(8):653–661, August, 2024. Publisher: Nature Publishing Group![Nanoscale spin rectifiers for harvesting ambient radiofrequency energy [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Radiofrequency harvesting using ambient wireless energy could be used to reduce the carbon footprint of electronic devices. However, ambient radiofrequency energy is weak (less than −20 dBm), and the performance of state-of-the-art radiofrequency rectifiers is restricted by thermodynamic limits and high-frequency parasitic impedance. Nanoscale spin rectifiers based on magnetic tunnel junctions have recently demonstrated high sensitivity, but suffer from a low a.c.-to-d.c. conversion efficiency (less than 1%). Here we report a sensitive spin rectifier rectenna that can harvest ambient radiofrequency signals between −62 and −20 dBm. We also develop an on-chip co-planar-waveguide-based spin rectifier array with a large zero-bias sensitivity (around 34,500 mV mW−1) and high efficiency (7.81%). The performance of our spin rectifier array relies on self-parametric excitation, driven by voltage-controlled magnetic anisotropy. We show that these spin rectifiers can be used to wirelessly power a sensor at a radiofrequency power of −27 dBm.
@article{sharma_nanoscale_2024,
title = {Nanoscale spin rectifiers for harvesting ambient radiofrequency energy},
volume = {7},
copyright = {2024 The Author(s), under exclusive licence to Springer Nature Limited},
issn = {2520-1131},
url = {https://www.nature.com/articles/s41928-024-01212-1},
doi = {10.1038/s41928-024-01212-1},
abstract = {Radiofrequency harvesting using ambient wireless energy could be used to reduce the carbon footprint of electronic devices. However, ambient radiofrequency energy is weak (less than −20 dBm), and the performance of state-of-the-art radiofrequency rectifiers is restricted by thermodynamic limits and high-frequency parasitic impedance. Nanoscale spin rectifiers based on magnetic tunnel junctions have recently demonstrated high sensitivity, but suffer from a low a.c.-to-d.c. conversion efficiency (less than 1\%). Here we report a sensitive spin rectifier rectenna that can harvest ambient radiofrequency signals between −62 and −20 dBm. We also develop an on-chip co-planar-waveguide-based spin rectifier array with a large zero-bias sensitivity (around 34,500 mV mW−1) and high efficiency (7.81\%). The performance of our spin rectifier array relies on self-parametric excitation, driven by voltage-controlled magnetic anisotropy. We show that these spin rectifiers can be used to wirelessly power a sensor at a radiofrequency power of −27 dBm.},
language = {en},
number = {8},
urldate = {2024-09-02},
journal = {Nature Electronics},
author = {Sharma, Raghav and Ngo, Tung and Raimondo, Eleonora and Giordano, Anna and Igarashi, Junta and Jinnai, Butsurin and Zhao, Shishun and Lei, Jiayu and Guo, Yong-Xin and Finocchio, Giovanni and Fukami, Shunsuke and Ohno, Hideo and Yang, Hyunsoo},
month = aug,
year = {2024},
note = {Publisher: Nature Publishing Group},
keywords = {Electronic and spintronic devices, Magnetic devices},
pages = {653--661},
}
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However, ambient radiofrequency energy is weak (less than −20 dBm), and the performance of state-of-the-art radiofrequency rectifiers is restricted by thermodynamic limits and high-frequency parasitic impedance. Nanoscale spin rectifiers based on magnetic tunnel junctions have recently demonstrated high sensitivity, but suffer from a low a.c.-to-d.c. conversion efficiency (less than 1%). Here we report a sensitive spin rectifier rectenna that can harvest ambient radiofrequency signals between −62 and −20 dBm. We also develop an on-chip co-planar-waveguide-based spin rectifier array with a large zero-bias sensitivity (around 34,500 mV mW−1) and high efficiency (7.81%). The performance of our spin rectifier array relies on self-parametric excitation, driven by voltage-controlled magnetic anisotropy. 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