Effect of site disorder on the resonant microwave absorption in Co2Fe0.5Ti0.5Si Heusler alloy thin films

Rahaman, M. and Longchar, L.A. and Haldar, Arabinda and et al, . (2022) Effect of site disorder on the resonant microwave absorption in Co2Fe0.5Ti0.5Si Heusler alloy thin films. Journal of Magnetism and Magnetic Materials, 559. pp. 1-10. ISSN 0304-8853

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Abstract

100 nm Co2Fe0.5Ti0.5Si (CFTS) thin films were grown on Si (1 0 0) substrate at different substrate temperatures TS to study the effect of site disorder on the magnetization relaxation processes and magnetic anisotropy in them. To this end, two different ferromagnetic resonance (FMR) techniques have been employed: broad-band (3 – 17 GHz) FMR at a fixed static magnetic field angle in the ‘in-plane’ (IP) sample geometry, and X-band (9.45 GHz) FMR at different polar field-angles, θH, in the ‘out-of-plane’ (OP) sample configuration. Increase in TS reduces the degree of disorder and improves crystalline order. Improvement in crystallinity, in turn, results in the decrease in the strength of magnetocrystalline anisotropy. Irrespective of the degree of disorder present, the OP anisotropy field, Hk⊥, is an order of magnitude higher than the IP counterpart, Hk‖. Out of the CFTS thin films studied, the film (TS500), deposited at TS = 500 °C, has the maximum L21 crystalline order, maximum saturation magnetization (MS = 779 G), and the least values for Hk‖ (5.3 Oe), Hk⊥ (17 Oe), Landé splitting factor, g = 2.02, and the Gilbert damping constant, α=5.5×10-3. These optimum values of MS, g and α, at room temperature, are conducive for spintronics applications. In the OP configuration, the FMR linewidth, ΔH⊥, mainly arises from the intrinsic Landau-Lifshitz-Gilbert damping and extrinsic angular spread of crystallite misorientation. However, the extrinsic two-magnon scattering contribution to ΔH⊥, is appreciable only in the angular range 70° ≤ θH ≤ 110°. © 2022 Elsevier B.V.

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IITH Creators:

IITH Creators	ORCiD
Haldar, Arabinda	https://orcid.org/0000-0002-0490-9719

Item Type:

Article

Additional Information:

The authors thank the Network Resource Center, School of Physics and Central Instrumental Laboratory, University of Hyderabad for permitting to use of the x-ray diffractometer and Electron Spin Reso- nance (ESR) Spectrometer. MR gratefully acknowledges the financial support received from the Department of Science and Technology (DST), India, in the form of the INSPIRE fellowship with grant No. DST/ INSPIRE Fellowship/2018/IF180087. LAL acknowledges UGC (India) -(Ref. No. 1384/ (CSIR-UGC-NET June 2018) fellowship. SNK is thankful to the Indian National Science Academy (INSA, India)) for funding research under the INSA Honorary Scientist scheme. SS thanks the UGC- DAE-CSR (India) for financial assistance under grant No. CSR-IC-244/ 2017-18/1325

Uncontrolled Keywords:

Anisotropy, Ferromagnetic resonance, Gilbert damping constant, Heusler Alloys, Microwave Absorption, Two-magnon Scattering

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

17 Jun 2022 11:13

Last Modified:

22 Jun 2022 07:39