Spin-Injection Terahertz Radiation in Magnetic Junctions

Electromagnetic radiation of 1 - 10 THz range is observed at room temperature in a structure with a point contact between a ferromagnetic rod and a thin ferromagnetic film under electric current of high enough density. The radiation is due to nonequilibrium spin injection between the components of the structure. By estimates, the injection can lead to inverted population of the spin subbands. The radiation power exceeds by orders of magnitude the thermal background (with the Joule heating taking into account) and follows the current without inertia. Efficiency of the oscillator depends strongly on the material used and quantum efficiency may exceed the unity. It means the stimulated radiation processes play an important role.

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Photothermal, Photoelectric, and Photothermoelectric Effects in Bi-Sb Thin Films in the Terahertz Frequency Range at Room Temperature

Photonics ◽

10.3390/photonics8030076 ◽

2021 ◽

Vol 8 (3) ◽

pp. 76

Author(s):

Mikhail K. Khodzitsky ◽

Petr S. Demchenko ◽

Dmitry V. Zykov ◽

Anton D. Zaitsev ◽

Elena S. Makarova ◽

...

Keyword(s):

Thin Films ◽

Terahertz Radiation ◽

Room Temperature ◽

Voltage Drop ◽

Radiation Detection ◽

Radiation Detectors ◽

Thz Radiation ◽

Terahertz Frequency ◽

Frequency Range ◽

Terahertz Frequency Range

The terahertz frequency range is promising for solving various practically important problems. However, for the terahertz technology development, there is still a problem with the lack of affordable and effective terahertz devices. One of the main tasks is to search for new materials with high sensitivity to terahertz radiation at room temperature. Bi1−xSbx thin films with various Sb concentrations seem to be suitable for such conditions. In this paper, the terahertz radiation influence onto the properties of thermoelectric Bi1−xSbx 200 nm films was investigated for the first time. The films were obtained by means of thermal evaporation in vacuum. They were affected by terahertz radiation at the frequency of 0.14 terahertz (THz) in the presence of thermal gradient, electric field or without these influences. The temporal dependencies of photoconductivity, temperature difference and voltage drop were measured. The obtained data demonstrate the possibility for practical use of Bi1−xSbx thin films for THz radiation detection. The results of our work promote the usage of these thermoelectric materials, as well as THz radiation detectors based on them, in various areas of modern THz photonics.

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Dynamical Spin Injection into p-Type Germanium at Room Temperature

Applied Physics Express ◽

10.7567/apex.6.023001 ◽

2013 ◽

Vol 6 (2) ◽

pp. 023001 ◽

Cited By ~ 30

Author(s):

Mariko Koike ◽

Eiji Shikoh ◽

Yuichiro Ando ◽

Teruya Shinjo ◽

Shinya Yamada ◽

...

Keyword(s):

Room Temperature ◽

Spin Injection ◽

Dynamical Spin ◽

P Type

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Fabrication and magnetic-electronic properties of van der Waals Cr4Te5 ferromagnetic film

CrystEngComm ◽

10.1039/d1ce01200b ◽

2021 ◽

Author(s):

Weiyuan Wang ◽

Jiyu Fan ◽

Hao Liu ◽

Huan Zheng ◽

Chuanlan Ma ◽

...

Keyword(s):

Electronic Properties ◽

Room Temperature ◽

Van Der Waals ◽

Ferromagnetic Film ◽

Ferromagnetic Materials ◽

Two Dimensional ◽

Actual Number ◽

Intrinsic Ferromagnetism

Exploiting two-dimensional room temperature ferromagnetic materials is always a significant and valuable work. However, the actual number of satisfied materials with intrinsic ferromagnetism is very limited. Here, the van der...

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Room temperature spin injection into SiC via Schottky barrier

Applied Physics Letters ◽

10.1063/1.5052193 ◽

2018 ◽

Vol 113 (22) ◽

pp. 222402 ◽

Cited By ~ 1

Author(s):

L. Huang ◽

H. Wu ◽

P. Liu ◽

X. M. Zhang ◽

B. S. Tao ◽

...

Keyword(s):

Schottky Barrier ◽

Room Temperature ◽

Spin Injection

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Room temperature detection of sub-terahertz radiation in double-grating-gate transistors

Optics Express ◽

10.1364/oe.18.006024 ◽

2010 ◽

Vol 18 (6) ◽

pp. 6024 ◽

Cited By ~ 42

Author(s):

D. Coquillat ◽

S. Nadar ◽

F. Teppe ◽

N. Dyakonova ◽

S. Boubanga-Tombet ◽

...

Keyword(s):

Terahertz Radiation ◽

Room Temperature ◽

Temperature Detection

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Electrical spin injection and accumulation in CoFe/MgO/Ge contacts at room temperature

Physical Review B ◽

10.1103/physrevb.84.165315 ◽

2011 ◽

Vol 84 (16) ◽

Cited By ~ 68

Author(s):

Kun-Rok Jeon ◽

Byoung-Chul Min ◽

Young-Hun Jo ◽

Hun-Sung Lee ◽

Il-Jae Shin ◽

...

Keyword(s):

Room Temperature ◽

Spin Injection ◽

Electrical Spin

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Modulating room temperature spin injection into GaN towards the high-efficiency spin-light emitting diodes

Applied Physics Express ◽

10.35848/1882-0786/ab810b ◽

2020 ◽

Vol 13 (4) ◽

pp. 043006 ◽

Cited By ~ 1

Author(s):

Anke Song ◽

Jiajun Chen ◽

Jinshen Lan ◽

Deyi Fu ◽

Jiangpeng Zhou ◽

...

Keyword(s):

Room Temperature ◽

High Efficiency ◽

Light Emitting Diodes ◽

Spin Injection ◽

Light Emitting

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Adhesion Properties between Swollen Hydrogels in Air

MRS Proceedings ◽

10.1557/proc-0897-j08-10 ◽

2005 ◽

Vol 897 ◽

Author(s):

Daisuke Sakasegawa ◽

Takaya Sato ◽

Motoaki Goto ◽

Atsushi Suzuki

Keyword(s):

Room Temperature ◽

Normal Force ◽

Adhesion Force ◽

Point Contact ◽

Sodium Acrylate ◽

Evaluation Technique ◽

Adhesive Properties ◽

Adhesion Properties ◽

Aluminum Ions ◽

Separation Velocity

AbstractAdhesion between swollen hydrogels was studied using a simple tack-evaluation technique by a point contact in air at room temperature. The hydrogel used here was poly(sodium acrylate) (PSA) gel physically cross-linked by aluminum ions. The adhesion force and the separation energy showed a power-law increase with separation velocity, normal force, and waiting period　prior to separate. Effects of the degrees of protonation in PSA as well as of dehydration on the adhesive properties are also presented. The results are discussed in terms of the surface molecular interaction and the bulk elastic and viscous properties.

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