scholarly journals Generation of charge current from magnetization oscillation via the inverse of voltage-controlled magnetic anisotropy effect

2020 ◽  
Vol 6 (32) ◽  
pp. eabc2618 ◽  
Author(s):  
Ambika Shanker Shukla ◽  
Akanksha Chouhan ◽  
Rachit Pandey ◽  
M. Raghupathi ◽  
Tatsuya Yamamoto ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Domain Walls ◽  
Magnetic Energy ◽  
Electrical Energy ◽  
Magnetization Dynamics ◽  
Charge Current ◽  
Faraday’S Law ◽  
Anisotropy Effect ◽  
Metallic Ferromagnet ◽  
Physical Phenomena

It is well known that oscillating magnetization induces charge current in a circuit via Faraday’s law of electromagnetic induction. New physical phenomena by which magnetization dynamics can produce charge current have gained considerable interest recently. For example, moving magnetization textures, such as domain walls, generates charge current through the spin-motive force. Here, we examine an entirely different effect, which couples magnetization and electric field at the interface between an ultrathin metallic ferromagnet and dielectric. We show that this coupling can convert magnetic energy into electrical energy. This phenomenon is the Onsager reciprocal of the voltage-controlled magnetic anisotropy effect. The effect provides a previously unexplored probe to measure the magnetization dynamics of nanomagnets.

scholarly journals Route towards efficient magnetization reversal driven by voltage control of magnetic anisotropy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Roxana-Alina One ◽  
Hélène Béa ◽  
Sever Mican ◽  
Marius Joldos ◽  
Pedro Brandão Veiga ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Random Access ◽  
Low Power Consumption ◽  
Surface Anisotropy ◽  
Magnetization Dynamics ◽  
Storage Density ◽  
Switching Regime ◽  
Major Interest ◽  
Out Of Plane

AbstractThe voltage controlled magnetic anisotropy (VCMA) becomes a subject of major interest for spintronics due to its promising potential outcome: fast magnetization manipulation in magnetoresistive random access memories with enhanced storage density and very low power consumption. Using a macrospin approach, we carried out a thorough analysis of the role of the VCMA on the magnetization dynamics of nanostructures with out-of-plane magnetic anisotropy. Diagrams of the magnetization switching have been computed depending on the material and experiment parameters (surface anisotropy, Gilbert damping, duration/amplitude of electric and magnetic field pulses) thus allowing predictive sets of parameters for optimum switching experiments. Two characteristic times of the trajectory of the magnetization were analyzed analytically and numerically setting a lower limit for the duration of the pulses. An interesting switching regime has been identified where the precessional reversal of magnetization does not depend on the voltage pulse duration. This represents a promising path for the magnetization control by VCMA with enhanced versatility.

Giant voltage-controlled magnetic anisotropy effect in a crystallographically strained CoFe system

2018 ◽  
Vol 11 (5) ◽  
pp. 053007 ◽  
Author(s):  
Yushi Kato ◽  
Hiroaki Yoda ◽  
Yoshiaki Saito ◽  
Soichi Oikawa ◽  
Keiko Fujii ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Anisotropy Effect

scholarly journals Electrical Energy Production Process from Landfill Gas

2019 ◽  
Vol 125 ◽  
pp. 13002
Author(s):  
Isworo Pujotomo ◽  
Septianissa Azzahra
Keyword(s):  
Solid Waste ◽  
Magnetic Energy ◽  
Landfill Gas ◽  
Electrical Potential ◽  
Electrical Energy ◽  
Gas Content ◽  
Metropolitan Cities ◽  
Electrical Energy Production ◽  
Infrastructure Services ◽  
Electrically Charged

Electrical energy is produced by objects that are electrically charged. Static electric charges will cause electrical potential energy, while dynamic electric charges will cause electric current and magnetic energy. The size of the population and the diversity of activities in metropolitan cities in Indonesia have resulted in general problems in urban infrastructure services, such as current waste problems. Waste is defined as solid waste consisting of organic substances which are considered useless and must be managed so as not to endanger the environment and protect development investment. Landfill gas is a gas produced by solid waste which is disposed of in landfills. The waste is piled up and pressed mechanically and the pressure from the layer above it. Because the condition becomes anaerobic, the organic matter decomposes and gas landfill is produced. This gas is increasingly gathering to be slowly released into the atmosphere and if it is not used or handled properly it will be dangerous because it can pollute the air and the atmosphere of the earth. The largest gas content found in LFG is methane by 45 - 60% and followed by carbon dioxide by 25-50%. Landfill gas is produced from the decomposition of organic waste material.

VOLTAGE-CONTROLLED MAGNETIC ANISOTROPY IN SPINTRONIC DEVICES

SPIN ◽  
2012 ◽  
Vol 02 (03) ◽  
pp. 1240002 ◽  
Author(s):  
PEDRAM KHALILI AMIRI ◽  
KANG L. WANG
Keyword(s):  
Magnetic Anisotropy ◽  
Random Access ◽  
Magnetic Tunnel Junction ◽  
Magnetic Films ◽  
Magnetization Dynamics ◽  
Spintronic Devices ◽  
Magnetic Random Access Memory ◽  
Thin Magnetic Films ◽  
Potential Applications ◽  
New Generation

Electric-field-control of magnetism can dramatically improve the energy efficiency of spintronic devices and enhance the performance of magnetic memories. More generally, it expands the range of applications of nonvolatile spintronic devices, by making them energetically competitive compared to conventional semiconductor solutions for logic and computation, thereby potentially enabling a new generation of ultralow-power nonvolatile spintronic systems. This paper reviews recent experiments on the voltage-controlled magnetic anisotropy (VCMA) effect in thin magnetic films, and their device implications. The interfacial perpendicular anisotropy in layered magnetic material stacks, as well as its modulation by voltage, are discussed. Ferromagnetic resonance experiments and VCMA-induced high-frequency magnetization dynamics are reviewed. Finally, we discuss recent progress on voltage-induced switching of magnetic tunnel junction devices and its potential applications to magnetic random access memory (MRAM).

Magnetic Anisotropy and Magnetization Dynamics of Individual Atoms and Clusters of Fe and Co on Pt(111)

2009 ◽  
Vol 102 (25) ◽  
Author(s):  
T. Balashov ◽  
T. Schuh ◽  
A. F. Takács ◽  
A. Ernst ◽  
S. Ostanin ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetization Dynamics

Energy Streamlines Analyses on Natural Convection Within Porous Square Enclosure With Internal Obstructions

2013 ◽  
Vol 5 (3) ◽  
Author(s):  
Syeda Humaira Tasnim ◽  
Shohel Mahmud ◽  
Animesh Dutta
Keyword(s):  
Natural Convection ◽  
Magnetic Energy ◽  
Convection Heat Transfer ◽  
Side Wall ◽  
Internal Flow ◽  
Electrical Energy ◽  
Darcy Number ◽  
Energy Potential ◽  
Transfer Energy ◽  
Square Enclosure

Natural convection through a porous layer heated from the side with internal flow obstructions have been investigated based on visualization of total energy flow via energy streamfunctions or energy streamlines. Energy streamline has been introduced previously by Mahmud and Fraser (2007, “Visualizing Energy Flows Through Energy Streamlines and Pathlines,” Int. J. Heat Mass Transfer, 50, pp. 3990–4002) as an alternate convection heat transfer energy visualization technique. Energy streamlines consider all forms of related energy; for example, thermal energy, potential energy, kinetic energy, electrical energy, magnetic energy, and chemical energy. A finite volume method has been employed to solve momentum and energy balance as well as postprocessing energy streamfunctions. A parametric study has been carried out using the following parameters: Rayleigh number (Ra) from 103 to 106, Darcy number (Da) from 10−4 to 10−3, dimensionless thin fin lengths (L) 0.25, 0.5, and 0.75, dimensionless positions (H) 0.25, 0.5, and 0.75 with Prandtl number (Pr) 0.7. One finding of the present study is that, adding an obstruction in a cavity is similar to reducing Da of the porous medium. Therefore, the average Nusselt number calculated on the hot wall of the cavity always degraded compared to the no obstruction case whenever a baffle is attached. Thus the attached horizontal obstruction adds some thermal insulation effect. This finding is important in double wall space filled with fiberglass insulation in contemporary buildings, where the side wall is reinforced on the inside with structural members.

Effect of the magnetic field in the plane of a garnet ferrite film with orthorhombic magnetic anisotropy on the dynamics of domain walls

2003 ◽  
Vol 45 (3) ◽  
pp. 503-507 ◽  
Author(s):  
V. V. Randoshkin ◽  
V. A. Polezhaev ◽  
N. N. Sysoev ◽  
Yu. N. Sazhin ◽  
V. N. Dudorov
Keyword(s):  
Magnetic Field ◽  
Magnetic Anisotropy ◽  
Domain Walls ◽  
Ferrite Film ◽  
Garnet Ferrite ◽  
The Magnetic Field
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