Magnetic domain structure and magneto-transport properties of laser ablated Co40Fe40B20 thin films

G. Venkat Swamy; P. K. Rout; Himanshu Pandey; B. Riscob; G. A. Basheed

doi:10.1088/2632-959X/acfd46

Magnetic domain structure and magneto-transport properties of laser ablated Co₄₀Fe₄₀B₂₀ thin films

G. Venkat Swamy^*, P. K. Rout, Himanshu Pandey, B. Riscob, G. A. Basheed

^*Corresponding author for this work

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

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Abstract

We report the magnetic domain structure, and electrical and magnetoresistance properties of laser ablated Co₄₀Fe₄₀B₂₀ (CoFeB) (6 to 36 nm) thin films deposited on SiO₂ / Si(001) substrates. Magnetic force microscopy performed on annealed CoFeB thin films revealed larger magnetic domains, which are formed due to strong exchange coupling between the grains. The temperature-dependent sheet resistance of as-deposited thin films revealed that the observed non-metallic behavior is due to intragrain-tunneling and SiO₂ inclusions in the amorphous matrix. The metallic behavior of annealed CoFeB thin films is due to electron scattering from grain boundaries and granularity correlated to the formation of nano-crystallites. Thickness and field-dependent magneto-transport studies show higher magnetoresistance values for thinner annealed CoFeB films due to more scattering events upon crystallization, which is consistent with the granular nature of the annealed thin films.

Original language	English
Article number	045002
Number of pages	6
Journal	Nano Express
Volume	4
Issue number	4
DOIs	https://doi.org/10.1088/2632-959X/acfd46
Publication status	Published - 2023

Keywords

ferromagnetic thin films
magnetic domain structure
magneto transport
soft magneto crystalline materials

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10.1088/2632-959X/acfd46

Swamy_2023_Nano_Express_4_045002Final published version, 958 KBLicence: CC BY

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title = "Magnetic domain structure and magneto-transport properties of laser ablated Co40Fe40B20 thin films",

abstract = "We report the magnetic domain structure, and electrical and magnetoresistance properties of laser ablated Co40Fe40B20 (CoFeB) (6 to 36 nm) thin films deposited on SiO2 / Si(001) substrates. Magnetic force microscopy performed on annealed CoFeB thin films revealed larger magnetic domains, which are formed due to strong exchange coupling between the grains. The temperature-dependent sheet resistance of as-deposited thin films revealed that the observed non-metallic behavior is due to intragrain-tunneling and SiO2 inclusions in the amorphous matrix. The metallic behavior of annealed CoFeB thin films is due to electron scattering from grain boundaries and granularity correlated to the formation of nano-crystallites. Thickness and field-dependent magneto-transport studies show higher magnetoresistance values for thinner annealed CoFeB films due to more scattering events upon crystallization, which is consistent with the granular nature of the annealed thin films.",

keywords = "ferromagnetic thin films, magnetic domain structure, magneto transport, soft magneto crystalline materials",

author = "Swamy, {G. Venkat} and Rout, {P. K.} and Himanshu Pandey and B. Riscob and Basheed, {G. A.}",

year = "2023",

doi = "10.1088/2632-959X/acfd46",

language = "English",

volume = "4",

journal = "Nano Express",

issn = "2632-959X",

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TY - JOUR

T1 - Magnetic domain structure and magneto-transport properties of laser ablated Co40Fe40B20 thin films

AU - Swamy, G. Venkat

AU - Rout, P. K.

AU - Pandey, Himanshu

AU - Riscob, B.

AU - Basheed, G. A.

PY - 2023

Y1 - 2023

N2 - We report the magnetic domain structure, and electrical and magnetoresistance properties of laser ablated Co40Fe40B20 (CoFeB) (6 to 36 nm) thin films deposited on SiO2 / Si(001) substrates. Magnetic force microscopy performed on annealed CoFeB thin films revealed larger magnetic domains, which are formed due to strong exchange coupling between the grains. The temperature-dependent sheet resistance of as-deposited thin films revealed that the observed non-metallic behavior is due to intragrain-tunneling and SiO2 inclusions in the amorphous matrix. The metallic behavior of annealed CoFeB thin films is due to electron scattering from grain boundaries and granularity correlated to the formation of nano-crystallites. Thickness and field-dependent magneto-transport studies show higher magnetoresistance values for thinner annealed CoFeB films due to more scattering events upon crystallization, which is consistent with the granular nature of the annealed thin films.

AB - We report the magnetic domain structure, and electrical and magnetoresistance properties of laser ablated Co40Fe40B20 (CoFeB) (6 to 36 nm) thin films deposited on SiO2 / Si(001) substrates. Magnetic force microscopy performed on annealed CoFeB thin films revealed larger magnetic domains, which are formed due to strong exchange coupling between the grains. The temperature-dependent sheet resistance of as-deposited thin films revealed that the observed non-metallic behavior is due to intragrain-tunneling and SiO2 inclusions in the amorphous matrix. The metallic behavior of annealed CoFeB thin films is due to electron scattering from grain boundaries and granularity correlated to the formation of nano-crystallites. Thickness and field-dependent magneto-transport studies show higher magnetoresistance values for thinner annealed CoFeB films due to more scattering events upon crystallization, which is consistent with the granular nature of the annealed thin films.

KW - ferromagnetic thin films

KW - magnetic domain structure

KW - magneto transport

KW - soft magneto crystalline materials

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U2 - 10.1088/2632-959X/acfd46

DO - 10.1088/2632-959X/acfd46

M3 - Article

AN - SCOPUS:85175640149

SN - 2632-959X

VL - 4

JO - Nano Express

JF - Nano Express

IS - 4

M1 - 045002

ER -

Magnetic domain structure and magneto-transport properties of laser ablated Co₄₀Fe₄₀B₂₀ thin films

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