Aravinthan Devarasu

Aravinthan Devarasu
Chennai Institute Of Technology | CIT · Centre for Nonlinear Systems

M.Sc., M.Phil., Ph.D., (Physics)

About

11
Publications
1,431
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22
Citations
Introduction
I am working as a Assistant Professor in Center for Nonlinear Systems, Chennai Institute of Technology, Chennai, Tamilnadu, India. My Research Interests: Spintronics, Nonlinear Dynamics
Additional affiliations
August 2015 - September 2017
Bharathidasan University
Position
  • Senior Researcher
October 2011 - August 2015
Bharathidasan University
Position
  • DST-INSPIRE Junior Research Fellow
Education
August 2010 - September 2011
Bharathidasan University
Field of study
  • Physics
July 2008 - April 2010
Bharathidasan University
Field of study
  • Physics
July 2005 - April 2008
Nehru Memorial College
Field of study
  • Physics

Publications

Publications (11)
Article
We derive fractional soliton and rogue wave solutions of the space–time fractional nonlinear Schrödinger (FNLS) equation in the existence of complex parity reflection - time reversal (PT)−symmetric and time-dependent potentials. We find that the fractional derivative variable transformation is a good approximation to reduce the space–time FNLS equa...
Article
Full-text available
We investigated the influence of oscillatory interlayer exchange coupling (OXC) on spin transfer torque (STT)-assisted magnetization switching in the pentalayer nanopillar structure. The impact of OXC between the ferromagnetic layers in the pentalayer nanopillar is realised by solving the associated governing equation, namely Landau-Lifshitz-Gilber...
Article
Full-text available
The effect of biquadratic coupling on spin transfer torque-assisted magnetization switching in the pentalayer nanopillar device is studied by numerically solving the magnetization switching dynamics of the free layer governed by the Landau- Lifshitz-Gilbert-Slonczewski (LLGS) equation. Magnetization switching time in the absence of biquadratic coup...
Thesis
Full-text available
Spin transfer torque induced magnetization switching has recently attracted much interest due to its potential applications in magnetic random access memory (MRAM), fast programmable logic, high-density magnetic storage devices, magnetic sensors and in high frequency devices for telecommunications. Magnetic storage devices and magnetic sensors base...
Article
Full-text available
We have studied the effect of orange peel coupling on spin transfer torque magnetization switching in different nanopillar devices. The magnetization switching dynamics of the free layer of the nanopillar device is studied by solving the dynamical equation governed by a Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equation. The switching time is calc...
Article
Full-text available
The spin transfer torque assisted magnetization switching in a pentalayer nanopillar device is theoretically studied for different biasing configurations. The magnetization switching time is calculated for three different configurations (standard(no biasing), pinned layer biasing and free layer biasing), by numerically solving the governing dynamic...
Article
Full-text available
The effect of biquadratic coupling on spin current induced magnetization switching in a Co/Cu/Ni-Fe nanopillar device is investigated by solving the free layer magnetization switching dynamics governed by the Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equation. The LLGS equation is numerically solved by using Runge-Kutta fourth order procedure for...
Article
Full-text available
We have studied the effect of biquadratic coupling (BQC) on critical current density in the Co/Cu/Ni-Fe nanopillar by solving the magnetization switching dynamics of the free layer which is governed by Landau- Lifshitz-Gilbert-Slonczewski (LLGS) equation. The LLGS equation is analytically solved for the time independent case and value of the critic...
Article
Full-text available
The impact of orange peel coupling on spin current induced magnetization switching in a Co/Cu/Ni-Fe nanopillar device is investigated by solving the switching dynamics of magnetization of the free layer governed by the Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equation. The value of the critical current required to initiate the magnetization switc...

Questions

Questions (4)
Question
Normally in trilayer structure (Pinned / spacer (nonmagnetic metal) / free layer), status of the free layer was read by the analyser kept in the top of free layer. But in the pentalayer (Pinned layer 1 / spacer (nonmagnetic metal) / free layer / spacer(nonmagnetic metal) / Pinned layer 2), the additional pinned layer is kept above the free layer. Theoretically, we can easily study the magnetization switching by solving the dynamical equation. Experimentally, how can read the magnetization status of the free layer in the pentalayer structure?
Question
We have take a trilayer nanopillar consists of two ferromagnetic layer separated by a nonmagnetic metal layer. Suppose if we consider ferromagnetic layers are align parallel(and aligned along easy axis, say X-axis) and ferromagnetic layers lies in XY-plane, then RKKY coupling arises due to the conduction electron reflection at the interface of the ferromagnetic layer. We can be express it interms of the coupling field. My doubt is, In which direction the coupling field will act (in which direction we express the magnetization in the field equation)?
P.S: I herewith attached the article having the expression for RKKY field.
Question
RKKY coupling or oscillating interlayer exchange copuling between the two ferromagnetic layers separated by a nonmagnetic spacer.Conduction
electron reflection at the interface of the ferromagnetic layer produces a RKKY or coupling field. In which direction this field will act?
Question
Equation for the RKKY or Oscillating interlayer exchange coupling field contains the following parameters
  1. Amplitude of the interlayer coupling(J)
  2. Thicknesses of the free layer(tf) and spacer layers (ts)
  3. Period and Phase of the oscillating electron.
  4. Magnetic material name or vlaue of saturation magnetization.
Can anyone suggest the article / book contains the above parameters?

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