Compact Superconducting Terahertz Source Operating in Liquid Nitrogen

Hao, Lujiang; Ji, Min; Yuan, Jie; An, D. Y.; Li, M. Y.; Zhou, Xianjing; Huang, Y.; Sun, Huili; Zhu, Qiang; Rudau, F.; Wieland, R.; Kinev, Nickolay V.; Li, J.; Xu, Wei; Jin, Biaobing; Chen, J.; Hatano, Takeshi; Koshelets, V. P.; Koelle, D.; Kleiner, R.; Wang, H. B.; Wu, Peiheng

doi:10.1103/physrevapplied.3.024006

Cited by 41 publications

(25 citation statements)

References 51 publications

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“…In a TM/FM bilayer structure, the SHE-induced transverse spin current s J that quantifies the spins being absorbed by the FM layer can be expressed For TMs, W has been reported to possess the largest internal spin Hall ratio and DL-SOT efficiency at room temperature, 0.30 DL ξ ≈ [17]. The efficacy of the SHE from W has been demonstrated and characterized through DL-SOT switching measurements [6,18,19], harmonic voltage methods [20], spin-pumping measurements [21], spin-Hall magnetoresistance measurements [22][23][24], and optical approaches [25,26]. The strength of the SHE in W is also known to be strongly phase dependent: The resistive β-phase or amorphous phase has been experimentally shown to have greater SHE and DL-SOT efficiency while compare to the conductive α-phase or crystalline phase [6,22,26].…”

Section: Introductionmentioning

confidence: 99%

Comparative study on spin-orbit torque efficiencies from W/ferromagnetic and W/ferrimagnetic heterostructures

Wang

Chen

et al. 2018

Phys. Rev. Materials

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It has been shown that W in its resistive form possesses the largest spin-Hall ratio among all heavy transition metals, which makes it a good candidate for generating efficient dampinglike spin-orbit torque (DL-SOT) acting upon adjacent ferromagnetic or ferrimagnetic (FM) layer. Here we provide a systematic study on the spin transport properties of W/FM magnetic heterostructures with the FM layer being ferromagnetic Co 20 Fe 60 B 20 or ferrimagnetic Co 63 Tb 37 with perpendicular magnetic anisotropy. The DL-SOT efficiency DL ξ , which is characterized by a current-induced hysteresis loop shift method, is found to be correlated to the microstructure of W buffer layer in both W/Co 20 Fe 60 B 20 and W/Co 63 Tb 37 systems. Maximum values of 0.144 DL ξ ≈ and 0.116 DL ξ ≈ are achieved when the W layer is partially amorphous in the W/Co 20 Fe 60 B 20 and W/Co 63 Tb 37 heterostructures, respectively. Our results suggest that the spin Hall effect from resistive phase of W can be utilized to effectively control both ferromagnetic and ferrimagnetic layers through a DL-SOT mechanism. † / 2 s S He J e T J θ = h , where TM SH θ is the internal spin Hall ratio of the TM layer and TM e J represents the longitudinal charge current density flowing in the TM layer. TM/FM int T represents the spin transparency at the TM/FM interface [12,13] (note that TM/FM int 1 T = for a perfect transmission), which is related to the spin-mixing conductance [14,15]. The transmitted spin angular momentum from s J can be transferred to the magnetic moments in FM through a spin-transfer torque mechanism [16]. The final effect is therefore a dampinglike spin-orbit torque (DL-SOT) acting upon the FM layer, and the DL-SOT efficiency of a TM/FM bilayer heterostructure can be expressed as

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Section: Introductionmentioning

confidence: 99%

Comparative study on spin-orbit torque efficiencies from W/ferromagnetic and W/ferrimagnetic heterostructures

Wang

Chen

et al. 2018

Phys. Rev. Materials

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“…Spin-orbit (SO) field or torque generated by spin Hall effect (SHE) [1] from SO materials can effectively perform magnetization switching of an adjacent ferromagnetic layer [2][3][4][5] based on a spin current density acting on a ferromagnet (FM) interface shown in Eq.…”

mentioning

confidence: 99%

Anomalous Spin-Orbit Field via the Rashba-Edelstein Effect at theW/PtInterface

et al. 2020

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We have studied spin-orbit (SO) field in Ni80Fe20(Py)/W/Pt trilayer by means of spintorque ferromagnetic resonance, and demonstrated that the W/Pt interface generates an extra SO field acting on the Py layer. This unprecedented field originates from the following three processes, 1) spin accumulation at W/Pt interface via the Rashba-Edelstein effect, 2) diffusive spin transport in the W layer, and 3) spin absorption into the Py layer through accumulation at the Py/W interface. Our result means that we can create extra SO field away from the ferromagnet/ metal interface and control its strength by a combination of two different metals.

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“…Figure 2.60: Circular Waveguide (CWG) at THz frequencies 2. a) HE 11 mode E-field lines and far-field spatial intensity distribution of a a = 1.6 mm radius silver CWG at 2.5 THz. Field image of top right is the total magnitude, whereas down images correspond to horizontal polarization (left) and vertical polarization (right) [383]; b) Photograph of the probe implemented in [384], which consists of a stainless-steel tube acting as a CWG and a hollow copper container hosting the emitter.…”

Section: Metallic (Microwave) Waveguides and Transmission Linesmentioning

confidence: 99%

“…Also, it is mentioned that one limitation of this structure is that thicker Polyethylenes (PEs) coatings are not possible because its poor solubility in solvent, thus reducing the described design benefits for the lower THz frequencies. Some practical uses of the CWG are found in [384], [387]- [389]. In [387], an overmoded CWG was part of a vacuum electronic tube source operating at f = 0.65 THz.…”

Section: Metallic (Microwave) Waveguides and Transmission Linesmentioning

confidence: 99%

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Analysis and design of efficient passive components for the millimeter-wave and THz bands

Verdú¹,

Antonio²

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To my parents, brother and sister."Success is peace of mind which is a direct result of self-satisfaction in knowing you made the effort to become the best of which you are capable."Jonh Wooden "Lo que con mucho trabajo se adquiere, más se ama." Aristóteles AgradecimientosLa realización de esta tesis ha implicado no pocos años de trabajo y esfuerzo. Durante este importante periodo de mi vida han sido muchas las personas han estado a mi lado, brindándome su apoyo, ayuda, cariño y amor. Ya sea de una forma u otra, todas estas personas han contribuido a que este trabajo haya sido posible dando como fruto esta tesis. A todos ellos, me gustaría dedicarles un agradecimiento muy especial de todo corazón.Sin duda alguna, debo dar las gracias en primer lugar a mi director de tesis Mariano Baquero. Mariano, has sido un padre para mí profesionalmente hablando. Te conocí como alumno en las clases de Microondas, en las cuales me abriste la puerta a un conocimiento que me fascinó.Recuerdo perfectamente cuando fui a verte para preguntarte si podrías dirigirme el Proyecto Final de Carrera, y desde ese año 2009 hemos estado trabajando juntos. Quiero agradecerte no sólo haberme dado la oportunidad de trabajar en cada momento en elárea que más me ha gustado, sino el haberte preocupado por mí a nivel personal, velando siempre por mis intereses, ayudándome a desarrollarme personal y profesionalmente. Extiendo en este sentido mi agradecimiento a Miguel Ferrando. Si Mariano es el padre, tu serías sin duda el abuelo. Sin tu ayuda, la beca para la realización de esta tesis y los proyectos que han respaldado la misma no hubieran sido posibles. Tu esfuerzo ha permitido que el Grupo de Radiación Electromagnética (GRE) esté hoy dónde esta y que sus miembros nos beneficiemos de un entorno de trabajo excelente, produciendo trabajo de calidad. Debo agradecerte también tus siempre innovadoras ideas, algunas de las cuales se han convertido en una realidad plasmada en esta tesis.Una mención especial merece Daniel Sánchez. Dani, aunque tu nombre no figure como co-director bien sabes que podría estarlo. Jamás podré agradecerte lo suficiente la ayuda que me has prestado. Cuántas horas dedicadas a enseñarme en un sin fin de aspectos sin esperar nada a cambio, apoyándome también en los momentos difíciles, siempre presentes en una tesis. Bien sabes que lo mismo has hecho con cada uno tus compañeros, por eso eres el pilar del GRE Dani.Otra persona a la que estoy muy agradecido es a Vicente Boria. Tu activa colaboración en la dirección de esta tesis ha sido indispensable para la consecución de los resultados más relevantes de la misma. Sugeriste muy acertadamente una estancia en la Queen's University of Belfast, y me abriste la puerta a nuevas líneas de investigación en las cuales seguimos trabajando actualmente. Gracias por preocuparte por mi a nivel profesional y personal.En elámbito anterior, extiendo los agradecimientos a todo el GRE. It is also very important for me to acknowledge Prof. Vince Fusco. Thank you for hosting me in your group in Belfast ...

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Compact Superconducting Terahertz Source Operating in Liquid Nitrogen

Cited by 41 publications

References 51 publications

Comparative study on spin-orbit torque efficiencies from W/ferromagnetic and W/ferrimagnetic heterostructures

Comparative study on spin-orbit torque efficiencies from W/ferromagnetic and W/ferrimagnetic heterostructures

Anomalous Spin-Orbit Field via the Rashba-Edelstein Effect at theW/PtInterface

Analysis and design of efficient passive components for the millimeter-wave and THz bands

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