scholarly journals Terahertz Spin Currents and Inverse Spin Hall Effect in Thin-Film Heterostructures Containing Complex Magnetic Compounds

SPIN ◽  
2017 ◽  
Vol 07 (03) ◽  
pp. 1740010 ◽  
Author(s):  
T. Seifert ◽  
U. Martens ◽  
S. Günther ◽  
M. A. W. Schoen ◽  
F. Radu ◽  
...  
Keyword(s):  
Figure Of Merit ◽  
Spin Transport ◽  
Spin Current ◽  
Metallic Multilayers ◽  
Terahertz Emission ◽  
Conduction Electrons ◽  
Spin Currents ◽  
Optical Generation ◽  
Inverse Spin Hall Effect ◽  
Terahertz Emission Spectroscopy

Terahertz emission spectroscopy (TES) of ultrathin multilayers of magnetic and heavy metals has recently attracted much interest. This method not only provides fundamental insights into photoinduced spin transport and spin–orbit interaction at highest frequencies, but has also paved the way for applications such as efficient and ultrabroadband emitters of terahertz (THz) electromagnetic radiation. So far, predominantly standard ferromagnetic materials have been exploited. Here, by introducing a suitable figure of merit, we systematically compare the strength of THz emission from [Formula: see text]/Pt bilayers with [Formula: see text] being a complex ferro-, ferri- and antiferromagnetic metal, that is, dysprosium cobalt (DyCo5), gadolinium iron (Gd[Formula: see text]Fe[Formula: see text]), magnetite (Fe3O4) and iron rhodium (FeRh). We find that the performance in terms of spin-current generation not only depends on the spin polarization of the magnet’s conduction electrons, but also on the specific interface conditions, thereby suggesting TES to be a highly interface-sensitive technique. In general, our results are relevant for all applications that rely on the optical generation of ultrafast spin currents in spintronic metallic multilayers.

scholarly journals Spin transport in insulators without exchange stiffness

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Koichi Oyanagi ◽  
Saburo Takahashi ◽  
Ludo J. Cornelissen ◽  
Juan Shan ◽  
Shunsuke Daimon ◽  
...  
Keyword(s):  
Spin Transport ◽  
Spin Diffusion ◽  
Spin Current ◽  
Material Design ◽  
Magnetic Films ◽  
Design Strategies ◽  
Spintronic Devices ◽  
Spin Currents ◽  
New Material ◽  
Conventional Models

Abstract The discovery of new materials that efficiently transmit spin currents has been important for spintronics and material science. The electric insulator Gd3Ga5O12 (GGG), a standard substrate for growing magnetic films, can be a spin current generator, but has never been considered as a superior conduit for spin currents. Here we report spin current propagation in paramagnetic GGG over several microns. Surprisingly, spin transport persists up to temperatures of 100 K $$\gg$$ ≫ Tg = 180 mK, the magnetic glass-like transition temperature of GGG. At 5 K and 3.5 T, we find a spin diffusion length λGGG = 1.8 ± 0.2 μm and a spin conductivity σGGG = (7.3 ± 0.3) × 104 Sm−1 that is larger than that of the record quality magnet Y3Fe5O12 (YIG). We conclude that exchange stiffness is not required for efficient spin transport, which challenges conventional models and provides new material-design strategies for spintronic devices.

Terahertz emission from CoFeB/Cr/Pt trilayers: The role of Cr as both a spin current transporter and generator

2021 ◽  
Vol 118 (23) ◽  
pp. 232401
Author(s):  
Qi Zhang ◽  
Zhuangzhuang Chen ◽  
Huafeng Shi ◽  
Xin Chen ◽  
Abhishek Talapatra ◽  
...  
Keyword(s):  
Spin Current ◽  
Terahertz Emission

scholarly journals Anomalous spin Hall and inverse spin Hall effects in magnetic systems

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
X. R. Wang
Keyword(s):  
Hall Effect ◽  
Order Parameter ◽  
Spin Current ◽  
Spin Hall Effect ◽  
Magnetic Systems ◽  
Charge Current ◽  
Spin Currents ◽  
Tensor Quantity ◽  
Hall Effects ◽  
Spin Hall Effects

AbstractSpin current is a very important tensor quantity in spintronics. However, the well-known spin-Hall effect (SHE) can only generate a few of its components whose propagating and polarization directions are perpendicular with each other and to an applied charge current. It is highly desirable in applications to generate spin currents whose polarization can be in any possible direction. Here anomalous SHE and inverse spin-Hall effect (ISHE) in magnetic systems are predicted. Spin currents, whose polarisation and propagation are collinear or orthogonal with each other and along or perpendicular to the charge current, can be generated, depending on whether the applied charge current is along or perpendicular to the order parameter. In anomalous ISHEs, charge currents proportional to the order parameter can be along or perpendicular to the propagating or polarization directions of the spin current.

SPINMOTIVE FORCE IN MAGNETIC NANOSTRUCTURES

SPIN ◽  
2013 ◽  
Vol 03 (02) ◽  
pp. 1330004 ◽  
Author(s):  
JUN'ICHI IEDA ◽  
YUTA YAMANE ◽  
SADAMICHI MAEKAWA
Keyword(s):  
Energy Transfer ◽  
Spin Current ◽  
Magnetic Nanostructures ◽  
Mutual Interaction ◽  
Conduction Electrons ◽  
Recent Developments ◽  
Basic Concepts

The mutual interaction between spin current and magnetization is a key phenomenon in spintronics. This interaction leads to a spinmotive force, a mechanism of energy-transfer from magnetization into conduction electrons. In this paper, the basic concepts and recent developments of the spinmotive force are introduced.

Studies of interface polarization and magnetization dynamics using terahertz emission spectroscopy

2005 ◽  
Author(s):  
Shayne M. Harrel ◽  
James M. Schleicher ◽  
Eric Beaurepaire ◽  
Jean-Yves Bigot ◽  
Charles A. Schmuttenmaer
Keyword(s):  
Emission Spectroscopy ◽  
Magnetization Dynamics ◽  
Terahertz Emission ◽  
Interface Polarization ◽  
Terahertz Emission Spectroscopy

Helicity-dependent photocurrent in a Bi2Se3 thin film probed by terahertz emission spectroscopy

2016 ◽  
Vol 94 (16) ◽  
Author(s):  
Sun Young Hamh ◽  
Soon-Hee Park ◽  
Sahng-Kyoon Jerng ◽  
Jae Ho Jeon ◽  
Seung-Hyun Chun ◽  
...  
Keyword(s):  
Thin Film ◽  
Emission Spectroscopy ◽  
Terahertz Emission ◽  
Terahertz Emission Spectroscopy

scholarly journals Spin transport and spin dynamics in antiferromagnets

2021 ◽  
Author(s):  
◽  
Geert Hoogeboom
Keyword(s):  
Magnetic Field ◽  
Heavy Metal ◽  
Spin Transport ◽  
Spin Dynamics ◽  
Magnetic Moments ◽  
Spin Current ◽  
Active Role ◽  
Metal Films ◽  
Alternating Direction ◽  
High Processing

Ferromagnets (FMs) have been a key ingredient in information technology because it is easy to manipulate and read out the magnetization. Antiferromagnets (AFMs) have magnetic moments with alternating direction resulting in negligible magnetization. This gives them high processing and device downscaling features, but this also makes it challenging to manipulate and interact with the AFM order. This thesis studies this interaction with antiferromagnets. NiO AFM order has been read out by electrically injecting spin current via the spin Hall effect in thin heavy metal films. In DyFeO3, both Dy and Fe magnetic moments, their excitation and interaction have been probed. A magnetic field lifts the degeneracy of magnetic excitations with opposite magnon spin, allowing a spin current to be detected nonlocally. The AFM order and the generation of spin current can easily be controlled by an adjacent FM. Thereby, we show that AFMs have the potential to play an active role in spintronics.

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