Zobrazeno 1 - 10
of 66
pro vyhledávání: '"Dvornik, Mykola"'
Autor:
Capriata, Corrado Carlo Maria, Jiang, Sheng, Dvornik, Mykola, Åkerman, Johan, Malm, Bengt Gunnar
Nano-constriction spin-Hall nano-oscillators (NC-SHNOs) are one of the most promising alternatives among the microwave spintronics devices. They can provide highly coherent and widely tuneable microwave signals and can be fabricated at low temperatur
Externí odkaz:
http://arxiv.org/abs/2012.07594
Autor:
Eklund, Anders J., Dvornik, Mykola, Qejvanaj, Fatjon, Jiang, Sheng, Chung, Sunjae, Åkerman, Johan, Malm, B. Gunnar
Publikováno v:
Phys. Rev. B 103, 214433 (2021)
We investigate the origin of the experimentally observed varying current-frequency nonlinearity of the propagating spin wave mode in nano-contact spin torque oscillators. Nominally identical devices with 100 nm diameter are characterized by electrica
Externí odkaz:
http://arxiv.org/abs/2008.08357
Autor:
Fulara, Himanshu, Zahedinejad, Mohammad, Khymyn, Roman, Dvornik, Mykola, Fukami, Shunsuke, Kanai, Shun, Ohno, Hideo, Åkerman, Johan
Publikováno v:
Nat. Commun. 11, 4006 (2020)
Spin Hall nano-oscillators (SHNOs) are emerging spintronic devices for microwave signal generation and oscillator based neuromorphic computing combining nano-scale footprint, fast and ultra-wide microwave frequency tunability, CMOS compatibility, and
Externí odkaz:
http://arxiv.org/abs/2006.02151
The time domain stability of microwave spin torque oscillators (STOs) has been investigated by systematic micromagnetic simulations. A model based on internal spin wave reflection at grain boundaries with reduced exchange coupling was implemented and
Externí odkaz:
http://arxiv.org/abs/1909.08431
Autor:
Fulara, Himanshu, Zahedinejad, Mohammad, Khymyn, Roman, Awad, Ahmad, Muralidhar, Shreyas, Dvornik, Mykola, Åkerman, Johan
Publikováno v:
Sci. Adv. 5, eaax8467 (2019)
Spin-orbit torque (SOT) can drive sustained spin wave (SW) auto-oscillations in a class of emerging microwave devices known as spin Hall nano-oscillators (SHNOs), which have highly non-linear properties governing robust mutual synchronization at freq
Externí odkaz:
http://arxiv.org/abs/1904.06945
Autor:
Zahedinejad, Mohammad, Awad, Ahmad A., Muralidhar, Shreyas, Khymyn, Roman, Fulara, Himanshu, Mazraati, Hamid, Dvornik, Mykola, Åkerman, Johan
Spin Hall nano-oscillators (SHNOs) utilize pure spin currents to drive local regions of magnetic films and nanostructures into auto-oscillating precession. If such regions are placed in close proximity to each other they can interact and sometimes mu
Externí odkaz:
http://arxiv.org/abs/1812.09630
Autor:
Mazraati, Hamid, Muralidhar, Shreyas, Etesami, Seyyed Ruhollah, Zahedinejad, Mohammad, Banuazizi, Seyed Amirhossein, Chung, Sunjae, Awad, Ahmad A., Dvornik, Mykola, Åkerman, Johan
We study mutual synchronization in double nanoconstriction-based spin Hall nano-oscillators (SHNOs) under weak in-plane fields ($\mu_0H_\mathrm{IP}$ = 30-40 mT) and also investigate its angular dependence. We compare SHNOs with different nano-constri
Externí odkaz:
http://arxiv.org/abs/1812.06350
Autor:
Mazraati, Hamid, Etesami, Seyyed Ruhollah, Banuazizi, Seyed Amir Hossein, Chung, Sunjae, Houshang, Afshin, Awad, Ahmad A., Dvornik, Mykola, Åkerman, Johan
Publikováno v:
Phys. Rev. Applied 10, 054017 (2018)
We experimentally study the auto-oscillating spin-wave modes in NiFe/$\beta-$W constriction-based spin Hall nano-oscillators as a function of bias current, in-plane applied field strength, and azimuthal field angle, in the low-field range of 40-80 mT
Externí odkaz:
http://arxiv.org/abs/1806.03473
Autor:
Spicer, Timothy M, Keatley, Paul S, Dvornik, Mykola, Loughran, Thomas H J, Awad, A. A., Dürrenfeld, Philipp, Houshang, Afshin, Ranjbar, Mojtaba, Åkerman, Johan, Kruglyak, Volodymyr V., Hicken, Robert J
Injection of a radio frequency (RF) current was used to phase lock the SHNO to the TRSKM. The out of plane magnetization was detected by means of the polar magneto optical Kerr effect (MOKE). However, longitudinal MOKE images were dominated by an art
Externí odkaz:
http://arxiv.org/abs/1805.09212
Autor:
Spicer, Timothy M, Keatley, Paul S, Loughran, Thomas H J, Dvornik, Mykola, Awad, A. A., Dürrenfeld, Philipp, Houshang, Afshin, Ranjbar, Mojtaba, Åkerman, Johan, Kruglyak, Volodymyr V., Hicken, Robert J
Publikováno v:
Phys. Rev. B 98, 214438 (2018)
Time-resolved scanning Kerr microscopy (TRSKM) was used to study precessional magnetization dynamics induced by a radio frequency (RF) current within a Al$_2$O$_3$/Py(5 nm)/Pt(6 nm)/Au(150 nm) spin Hall nano-oscillator structure. The Au layer was for
Externí odkaz:
http://arxiv.org/abs/1805.00999