Evolution of ferromagnetic and spin-wave resonances with crystalline order in thin films of full-Heusler alloy Co2MnSi

Himanshu Pandey; P. C. Joshi; R. P. Pant; R. Prasad; S. Auluck; R. C. Budhani

doi:10.1063/1.3677996

Evolution of ferromagnetic and spin-wave resonances with crystalline order in thin films of full-Heusler alloy Co₂MnSi

Himanshu Pandey, P. C. Joshi, R. P. Pant, R. Prasad, S. Auluck, R. C. Budhani

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

We report the evolution of magnetic moment as well as magnetic anisotropy with crystalline order in Co₂MnSi thin films grown on (100) MgO by pulsed laser deposition. The films become more ordered as the annealing temperature (T_A) increases from 400 to 600 °C. The extent of L2₁ ordering in the films annealed at 600 °C is ≈96. The static magnetization measurements by vibrating sample magnetometry shows a maximum moment of 4.95 μ_B per formula unit with low coercivity (H_C ≈ 65 Oe) in the films annealed at 600 °C. A rigorous analysis of the azimuthal and polar angle dependent ferromagnetic resonance (FMR) measured at several temperatures allows determination of various anisotropy fields relevant to our system as a function of T_A. Finally, we have evaluated the exchange stiffness constant down to 100 K using spin wave modes in FMR spectra. We have also estimated the exchange energies as well as stiffness constant by ab initio calculations using the Korringa-Kohn-Rostoker method.

Original language	English
Article number	023912
Journal	Journal of Applied Physics
Volume	111
Issue number	2
DOIs	https://doi.org/10.1063/1.3677996
Publication status	Published - 15 Jan 2012
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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title = "Evolution of ferromagnetic and spin-wave resonances with crystalline order in thin films of full-Heusler alloy Co2MnSi",

abstract = "We report the evolution of magnetic moment as well as magnetic anisotropy with crystalline order in Co2MnSi thin films grown on (100) MgO by pulsed laser deposition. The films become more ordered as the annealing temperature (TA) increases from 400 to 600 °C. The extent of L21 ordering in the films annealed at 600 °C is ≈96. The static magnetization measurements by vibrating sample magnetometry shows a maximum moment of 4.95 μB per formula unit with low coercivity (HC ≈ 65 Oe) in the films annealed at 600 °C. A rigorous analysis of the azimuthal and polar angle dependent ferromagnetic resonance (FMR) measured at several temperatures allows determination of various anisotropy fields relevant to our system as a function of TA. Finally, we have evaluated the exchange stiffness constant down to 100 K using spin wave modes in FMR spectra. We have also estimated the exchange energies as well as stiffness constant by ab initio calculations using the Korringa-Kohn-Rostoker method.",

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T1 - Evolution of ferromagnetic and spin-wave resonances with crystalline order in thin films of full-Heusler alloy Co2MnSi

AU - Pandey, Himanshu

AU - Joshi, P. C.

AU - Pant, R. P.

AU - Prasad, R.

AU - Auluck, S.

AU - Budhani, R. C.

PY - 2012/1/15

Y1 - 2012/1/15

N2 - We report the evolution of magnetic moment as well as magnetic anisotropy with crystalline order in Co2MnSi thin films grown on (100) MgO by pulsed laser deposition. The films become more ordered as the annealing temperature (TA) increases from 400 to 600 °C. The extent of L21 ordering in the films annealed at 600 °C is ≈96. The static magnetization measurements by vibrating sample magnetometry shows a maximum moment of 4.95 μB per formula unit with low coercivity (HC ≈ 65 Oe) in the films annealed at 600 °C. A rigorous analysis of the azimuthal and polar angle dependent ferromagnetic resonance (FMR) measured at several temperatures allows determination of various anisotropy fields relevant to our system as a function of TA. Finally, we have evaluated the exchange stiffness constant down to 100 K using spin wave modes in FMR spectra. We have also estimated the exchange energies as well as stiffness constant by ab initio calculations using the Korringa-Kohn-Rostoker method.

AB - We report the evolution of magnetic moment as well as magnetic anisotropy with crystalline order in Co2MnSi thin films grown on (100) MgO by pulsed laser deposition. The films become more ordered as the annealing temperature (TA) increases from 400 to 600 °C. The extent of L21 ordering in the films annealed at 600 °C is ≈96. The static magnetization measurements by vibrating sample magnetometry shows a maximum moment of 4.95 μB per formula unit with low coercivity (HC ≈ 65 Oe) in the films annealed at 600 °C. A rigorous analysis of the azimuthal and polar angle dependent ferromagnetic resonance (FMR) measured at several temperatures allows determination of various anisotropy fields relevant to our system as a function of TA. Finally, we have evaluated the exchange stiffness constant down to 100 K using spin wave modes in FMR spectra. We have also estimated the exchange energies as well as stiffness constant by ab initio calculations using the Korringa-Kohn-Rostoker method.

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Evolution of ferromagnetic and spin-wave resonances with crystalline order in thin films of full-Heusler alloy Co₂MnSi

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