Magnetic and topographical modifications of amorphous Co-Fe thin films induced by high energy Ag7+ ion irradiation

G. Pookat; T. Hysen; S. H. Al-Harthi; I. A. Al-Omari; R. Lisha; D. K. Avasthi; M. R. Anantharaman

doi:10.1016/j.nimb.2013.05.025

Magnetic and topographical modifications of amorphous Co-Fe thin films induced by high energy Ag⁷⁺ ion irradiation

G. Pookat, T. Hysen, S. H. Al-Harthi, I. A. Al-Omari, R. Lisha, D. K. Avasthi, M. R. Anantharaman^*

^*Corresponding author for this work

Physics

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

4 Citations (Scopus)

Abstract

We have investigated the effects of swift heavy ion irradiation on thermally evaporated 44 nm thick, amorphous Co₇₇Fe₂₃ thin films on silicon substrates using 100 MeV Ag⁷⁺ ions fluences of 1 × 10¹¹ ions/cm², 1 × 10¹² ions/cm², 1 × 10¹³ ions/cm², and 3 × 10¹³ ions/cm². The structural modifications upon swift heavy irradiation were investigated using glancing angle X-ray diffraction. The surface morphological evolution of thin film with irradiation was studied using Atomic Force Microscopy. Power spectral density analysis was used to correlate the roughness variation with structural modifications investigated using X-ray diffraction. Magnetic measurements were carried out using vibrating sample magnetometry and the observed variation in coercivity of the irradiated films is explained on the basis of stress relaxation. Magnetic force microscopy images are subjected to analysis using the scanning probe image processor software. These results are in agreement with the results obtained using vibrating sample magnetometry. The magnetic and structural properties are correlated.

Original language	English
Pages (from-to)	81-86
Number of pages	6
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	310
DOIs	https://doi.org/10.1016/j.nimb.2013.05.025
Publication status	Published - 2013

Keywords

Amorphous structure
Co-Fe thin films
SHI irradiation
SRIM simulation
Structural modification

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

Access to Document

10.1016/j.nimb.2013.05.025

Cite this

Pookat, G., Hysen, T., Al-Harthi, S. H., Al-Omari, I. A., Lisha, R., Avasthi, D. K., & Anantharaman, M. R. (2013). Magnetic and topographical modifications of amorphous Co-Fe thin films induced by high energy Ag⁷⁺ ion irradiation. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 310, 81-86. https://doi.org/10.1016/j.nimb.2013.05.025

Magnetic and topographical modifications of amorphous Co-Fe thin films induced by high energy Ag⁷⁺ ion irradiation. / Pookat, G.; Hysen, T.; Al-Harthi, S. H. et al.
In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 310, 2013, p. 81-86.

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

Pookat, G, Hysen, T, Al-Harthi, SH , Al-Omari, IA, Lisha, R, Avasthi, DK & Anantharaman, MR 2013, 'Magnetic and topographical modifications of amorphous Co-Fe thin films induced by high energy Ag⁷⁺ ion irradiation', Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, vol. 310, pp. 81-86. https://doi.org/10.1016/j.nimb.2013.05.025

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title = "Magnetic and topographical modifications of amorphous Co-Fe thin films induced by high energy Ag7+ ion irradiation",

abstract = "We have investigated the effects of swift heavy ion irradiation on thermally evaporated 44 nm thick, amorphous Co77Fe23 thin films on silicon substrates using 100 MeV Ag7+ ions fluences of 1 × 1011 ions/cm2, 1 × 1012 ions/cm2, 1 × 1013 ions/cm2, and 3 × 1013 ions/cm2. The structural modifications upon swift heavy irradiation were investigated using glancing angle X-ray diffraction. The surface morphological evolution of thin film with irradiation was studied using Atomic Force Microscopy. Power spectral density analysis was used to correlate the roughness variation with structural modifications investigated using X-ray diffraction. Magnetic measurements were carried out using vibrating sample magnetometry and the observed variation in coercivity of the irradiated films is explained on the basis of stress relaxation. Magnetic force microscopy images are subjected to analysis using the scanning probe image processor software. These results are in agreement with the results obtained using vibrating sample magnetometry. The magnetic and structural properties are correlated.",

keywords = "Amorphous structure, Co-Fe thin films, SHI irradiation, SRIM simulation, Structural modification",

author = "G. Pookat and T. Hysen and Al-Harthi, {S. H.} and Al-Omari, {I. A.} and R. Lisha and Avasthi, {D. K.} and Anantharaman, {M. R.}",

note = "Funding Information: GP acknowledges UGC, India for providing financial assistance in the form of RFSMS fellowship (No. F4-3/2006(BSR)/8-3/2007(BSR) ). H.T. acknowledges financial assistance received from UGC-FDP, India & DST FIST project received by Department of Physics, Christian College, Chengannur. Kerala, India. LR is thankful to IUAC, New Delhi for providing financial assistance in the form of UFUP project. GP, HT, LR and MRA are thankful to IUAC, New Delhi, India and UGC-DAE Consortium, Indore Centre, Khandwa Road, Indore, India for providing the facility to carry out the experiment. Dr. I. A. Al-Omari would like to thank Sultan Qaboos University for the support under Grant number IG/SCI/PHYS/12/02.MRA acknowledges Department of Science and Technology (DST)-Nanomission (No. SR/NM/NS-120/2010 (G)) and DST-DAAD (INT/FRG/DAAD/P-207/2011 ) for providing necessary facilities and financial assistance. ",

year = "2013",

doi = "10.1016/j.nimb.2013.05.025",

language = "English",

volume = "310",

pages = "81--86",

journal = "Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms",

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T1 - Magnetic and topographical modifications of amorphous Co-Fe thin films induced by high energy Ag7+ ion irradiation

AU - Pookat, G.

AU - Hysen, T.

AU - Al-Harthi, S. H.

AU - Al-Omari, I. A.

AU - Lisha, R.

AU - Avasthi, D. K.

AU - Anantharaman, M. R.

N1 - Funding Information: GP acknowledges UGC, India for providing financial assistance in the form of RFSMS fellowship (No. F4-3/2006(BSR)/8-3/2007(BSR) ). H.T. acknowledges financial assistance received from UGC-FDP, India & DST FIST project received by Department of Physics, Christian College, Chengannur. Kerala, India. LR is thankful to IUAC, New Delhi for providing financial assistance in the form of UFUP project. GP, HT, LR and MRA are thankful to IUAC, New Delhi, India and UGC-DAE Consortium, Indore Centre, Khandwa Road, Indore, India for providing the facility to carry out the experiment. Dr. I. A. Al-Omari would like to thank Sultan Qaboos University for the support under Grant number IG/SCI/PHYS/12/02.MRA acknowledges Department of Science and Technology (DST)-Nanomission (No. SR/NM/NS-120/2010 (G)) and DST-DAAD (INT/FRG/DAAD/P-207/2011 ) for providing necessary facilities and financial assistance.

PY - 2013

Y1 - 2013

N2 - We have investigated the effects of swift heavy ion irradiation on thermally evaporated 44 nm thick, amorphous Co77Fe23 thin films on silicon substrates using 100 MeV Ag7+ ions fluences of 1 × 1011 ions/cm2, 1 × 1012 ions/cm2, 1 × 1013 ions/cm2, and 3 × 1013 ions/cm2. The structural modifications upon swift heavy irradiation were investigated using glancing angle X-ray diffraction. The surface morphological evolution of thin film with irradiation was studied using Atomic Force Microscopy. Power spectral density analysis was used to correlate the roughness variation with structural modifications investigated using X-ray diffraction. Magnetic measurements were carried out using vibrating sample magnetometry and the observed variation in coercivity of the irradiated films is explained on the basis of stress relaxation. Magnetic force microscopy images are subjected to analysis using the scanning probe image processor software. These results are in agreement with the results obtained using vibrating sample magnetometry. The magnetic and structural properties are correlated.

AB - We have investigated the effects of swift heavy ion irradiation on thermally evaporated 44 nm thick, amorphous Co77Fe23 thin films on silicon substrates using 100 MeV Ag7+ ions fluences of 1 × 1011 ions/cm2, 1 × 1012 ions/cm2, 1 × 1013 ions/cm2, and 3 × 1013 ions/cm2. The structural modifications upon swift heavy irradiation were investigated using glancing angle X-ray diffraction. The surface morphological evolution of thin film with irradiation was studied using Atomic Force Microscopy. Power spectral density analysis was used to correlate the roughness variation with structural modifications investigated using X-ray diffraction. Magnetic measurements were carried out using vibrating sample magnetometry and the observed variation in coercivity of the irradiated films is explained on the basis of stress relaxation. Magnetic force microscopy images are subjected to analysis using the scanning probe image processor software. These results are in agreement with the results obtained using vibrating sample magnetometry. The magnetic and structural properties are correlated.

KW - Amorphous structure

KW - Co-Fe thin films

KW - SHI irradiation

KW - SRIM simulation

KW - Structural modification

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