Effect of Pt layers on chemical ordering in FePt thin films

R. Gupta; R. Medwal; P. Sharma; A. K. Mahapatro; S. Annapoorni

doi:10.1016/j.spmi.2013.10.006

Effect of Pt layers on chemical ordering in FePt thin films

R. Gupta, R. Medwal, P. Sharma, A. K. Mahapatro, S. Annapoorni

New Industry Creation Hatchery Center (NICHe)

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

6 Citations (Scopus)

Abstract

The tunability in the structural and magnetic phases present in RF-sputtered Fe₃Pt thin films over Si (1 0 0) substrates have been studied by introducing thin films of platinum (Pt) as an underlayer and/or overlayers. Annealing of the Fe₃Pt thin films with Pt underlayers (Pt/Fe₃Pt) structures at 600 C for 1 h, indicates well organized nanostructured grains as imaged through an atomic force microscope (AFM). The evolution of superstructure peaks as well as the preferred orientation along (0 0 1) plane observed in the X-ray diffraction (XRD) study is well supported by the magnetic measurements. These annealed Pt/Fe₃Pt structures show high magnetocrystalline anisotropy and the presence of hard phase with a coercivity of 8.5 kOe. Here, the annealing process allows the adjacent Pt atoms to diffuse into the Fe₃Pt unit cells and triggers the structural transformation to chemically ordered L1₀ phase. An additional L1 ₂ phase is observed in the annealed Fe₃Pt thin films with Pt overlayer and underlayer (Pt/Fe₃Pt/Pt) tri-layered structures.

Original language	English
Pages (from-to)	408-417
Number of pages	10
Journal	Superlattices and Microstructures
Volume	64
DOIs	https://doi.org/10.1016/j.spmi.2013.10.006
Publication status	Published - 2013

Keywords

Anisotropy
L1 phase FePt thin films
Magnetocrystalline
Superlattice

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Electrical and Electronic Engineering

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@article{86fb402235da47a49a0adc9475204704,

title = "Effect of Pt layers on chemical ordering in FePt thin films",

abstract = "The tunability in the structural and magnetic phases present in RF-sputtered Fe3Pt thin films over Si (1 0 0) substrates have been studied by introducing thin films of platinum (Pt) as an underlayer and/or overlayers. Annealing of the Fe3Pt thin films with Pt underlayers (Pt/Fe3Pt) structures at 600 C for 1 h, indicates well organized nanostructured grains as imaged through an atomic force microscope (AFM). The evolution of superstructure peaks as well as the preferred orientation along (0 0 1) plane observed in the X-ray diffraction (XRD) study is well supported by the magnetic measurements. These annealed Pt/Fe3Pt structures show high magnetocrystalline anisotropy and the presence of hard phase with a coercivity of 8.5 kOe. Here, the annealing process allows the adjacent Pt atoms to diffuse into the Fe3Pt unit cells and triggers the structural transformation to chemically ordered L10 phase. An additional L1 2 phase is observed in the annealed Fe3Pt thin films with Pt overlayer and underlayer (Pt/Fe3Pt/Pt) tri-layered structures.",

keywords = "Anisotropy, L1 phase FePt thin films, Magnetocrystalline, Superlattice",

author = "R. Gupta and R. Medwal and P. Sharma and Mahapatro, {A. K.} and S. Annapoorni",

note = "Funding Information: Authors would like to acknowledge University Scientific Instrumentation Centre (USIC), University of Delhi for the measurements performed and Department of Science and Technology (DST) for their financial assistance through the project SR/NM/NS-45/2007. The authors would also like to thank Prof. S. Ghosh from School of Physical Sciences, Jawaharlal Nehru University (JNU) for the AFM measurements done. R. Gupta and R. Medwal would also like to acknowledge CSIR, India, for giving financial support in the form of fellowship under the CSIR-SRF scheme and P. Sharma would like to acknowledge M.Tech. fellowship received from DST, Nanomission.",

year = "2013",

doi = "10.1016/j.spmi.2013.10.006",

language = "English",

volume = "64",

pages = "408--417",

journal = "Superlattices and Microstructures",

issn = "0749-6036",

publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - Effect of Pt layers on chemical ordering in FePt thin films

AU - Gupta, R.

AU - Medwal, R.

AU - Sharma, P.

AU - Mahapatro, A. K.

AU - Annapoorni, S.

N1 - Funding Information: Authors would like to acknowledge University Scientific Instrumentation Centre (USIC), University of Delhi for the measurements performed and Department of Science and Technology (DST) for their financial assistance through the project SR/NM/NS-45/2007. The authors would also like to thank Prof. S. Ghosh from School of Physical Sciences, Jawaharlal Nehru University (JNU) for the AFM measurements done. R. Gupta and R. Medwal would also like to acknowledge CSIR, India, for giving financial support in the form of fellowship under the CSIR-SRF scheme and P. Sharma would like to acknowledge M.Tech. fellowship received from DST, Nanomission.

PY - 2013

Y1 - 2013

N2 - The tunability in the structural and magnetic phases present in RF-sputtered Fe3Pt thin films over Si (1 0 0) substrates have been studied by introducing thin films of platinum (Pt) as an underlayer and/or overlayers. Annealing of the Fe3Pt thin films with Pt underlayers (Pt/Fe3Pt) structures at 600 C for 1 h, indicates well organized nanostructured grains as imaged through an atomic force microscope (AFM). The evolution of superstructure peaks as well as the preferred orientation along (0 0 1) plane observed in the X-ray diffraction (XRD) study is well supported by the magnetic measurements. These annealed Pt/Fe3Pt structures show high magnetocrystalline anisotropy and the presence of hard phase with a coercivity of 8.5 kOe. Here, the annealing process allows the adjacent Pt atoms to diffuse into the Fe3Pt unit cells and triggers the structural transformation to chemically ordered L10 phase. An additional L1 2 phase is observed in the annealed Fe3Pt thin films with Pt overlayer and underlayer (Pt/Fe3Pt/Pt) tri-layered structures.

AB - The tunability in the structural and magnetic phases present in RF-sputtered Fe3Pt thin films over Si (1 0 0) substrates have been studied by introducing thin films of platinum (Pt) as an underlayer and/or overlayers. Annealing of the Fe3Pt thin films with Pt underlayers (Pt/Fe3Pt) structures at 600 C for 1 h, indicates well organized nanostructured grains as imaged through an atomic force microscope (AFM). The evolution of superstructure peaks as well as the preferred orientation along (0 0 1) plane observed in the X-ray diffraction (XRD) study is well supported by the magnetic measurements. These annealed Pt/Fe3Pt structures show high magnetocrystalline anisotropy and the presence of hard phase with a coercivity of 8.5 kOe. Here, the annealing process allows the adjacent Pt atoms to diffuse into the Fe3Pt unit cells and triggers the structural transformation to chemically ordered L10 phase. An additional L1 2 phase is observed in the annealed Fe3Pt thin films with Pt overlayer and underlayer (Pt/Fe3Pt/Pt) tri-layered structures.

KW - Anisotropy

KW - L1 phase FePt thin films

KW - Magnetocrystalline

KW - Superlattice

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