Laser induced local modification of magnetic domain in Co/Pt multilayer

Talapatra, A and Mohanty, Jyoti Ranjan (2016) Laser induced local modification of magnetic domain in Co/Pt multilayer. Journal of Magnetism and Magnetic Materials, 418. pp. 224-230. ISSN 0304-8853

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Manipulation of magnetic system by the use of laser has drawn the attention of contemporary research. We demonstrate here the modification of magnetic domain in perpendicularly magnetized Co/Pt multilayer by using ultrashort laser pulse. The as-prepared sample shows an out-of-plane saturation magnetic field of 803.4 mT and almost zero remanence with a labyrinth-like domain pattern at room temperature. Atomistic simulation showed that interaction with femto-second laser results in demagnetization of the material in 200 fs followed by a slower recovery. As it indicates a net loss in magnetization, so magnetic force microscopy is carried out to investigate the equilibrium state after the system is relaxed. Demagnetized random domains appeared at the centre of the laser spot with having a rim at the boundary which signifies a deterministic switching with respect to the neighbouring area. Rotation of domains at the central area with the application of small transverse field (100 mT) proves the region to be magnetically weaker. Systematic 3D micromagnetic simulation has been performed to model the laser induced change by selective reduction of anisotropy which is discussed in detail. This shows shrinking of domains to a near circular pattern to minimize the magnetostatic energy. 50% reduction in anisotropy energy is observed with increasing the total energy of the system and a sharp increase in demagnetization energy also takes place simultaneously. This also satisfies the anisotropy in domain rotation with the application of transverse field.

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IITH Creators:
IITH CreatorsORCiD
Mohanty, Jyoti RanjanUNSPECIFIED
Item Type: Article
Additional Information: The authors sincerely acknowledge Dr. Clemens von Korff Schmising from Technische Universit├Ąt Berlin for sending the sample, sharing experimental detail and useful discussions. Dr. R.F. L. Evans is thanked for his cooperation regarding the atomistic simulation. Dr. S. Angapanne from Centre for Nano and Soft Matter Sciences, Bangalore, India, is acknowledged for facilitating the SQUID measurement.
Uncontrolled Keywords: Laser; Magnetic domain; Magnetic multilayer; Micromagnetic simulation
Subjects: Physics > Magnetism
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 17 Mar 2016 05:31
Last Modified: 10 Nov 2017 05:11
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