New bandgap measurement technique for a half-metallic ferromagnet

Tariq F. Alhuwaymel; Ranjdar M. Abdullah; Oliver Whear; Teodor Huminiuc; Robert Carpenter; Mohamed El-Gomati; Atsufumi Hirohata

doi:10.1109/TMAG.2014.2322912

New bandgap measurement technique for a half-metallic ferromagnet

Tariq F. Alhuwaymel, Ranjdar M. Abdullah, Oliver Whear, Teodor Huminiuc, Robert Carpenter, Mohamed El-Gomati, Atsufumi Hirohata^*

^*Corresponding author for this work

School of Mathematics & Physics

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

Abstract

In this paper, we report our new optical method for the measurement of the bandgaps of half-metallic ferromagnets (HMFs) that are sensitive to both surface/interface and bulk regions of these ferromagnets depending on the light incident angles and resulting penetration depth. We measured the bandgap of polycrystalline Co₂FeSi Heusler alloy thin films at room temperature (RT) as an example. The Co₂FeSi thin films were deposited on MgO(001) and Si/SiO₂ substrates by sputter deposition. Circularly, polarized infrared light was used to excite the corresponding spin-polarized electrons, which were effectively absorbed by the bandgap of the Co₂FeSi Heusler alloy. The Co₂FeSi bandgap energy was repeatedly measured and it was found to be ∼ 0.094 eV at RT. This technique allows us to characterize the spin bandgap of HMFs directly.

Original language	English
Article number	014852504
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	50
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2014.2322912
Publication status	Published - 1 Nov 2014

Keywords

Bandgap measurement
CoFeSi Heusler alloy
half-metallic ferromagnet (HMF)

Access to Document

10.1109/TMAG.2014.2322912

Cite this

@article{79468e7fca6048bc8973487307573da5,

title = "New bandgap measurement technique for a half-metallic ferromagnet",

abstract = "In this paper, we report our new optical method for the measurement of the bandgaps of half-metallic ferromagnets (HMFs) that are sensitive to both surface/interface and bulk regions of these ferromagnets depending on the light incident angles and resulting penetration depth. We measured the bandgap of polycrystalline Co2FeSi Heusler alloy thin films at room temperature (RT) as an example. The Co2FeSi thin films were deposited on MgO(001) and Si/SiO2 substrates by sputter deposition. Circularly, polarized infrared light was used to excite the corresponding spin-polarized electrons, which were effectively absorbed by the bandgap of the Co2FeSi Heusler alloy. The Co2FeSi bandgap energy was repeatedly measured and it was found to be ∼ 0.094 eV at RT. This technique allows us to characterize the spin bandgap of HMFs directly.",

keywords = "Bandgap measurement, CoFeSi Heusler alloy, half-metallic ferromagnet (HMF)",

author = "Alhuwaymel, {Tariq F.} and Abdullah, {Ranjdar M.} and Oliver Whear and Teodor Huminiuc and Robert Carpenter and Mohamed El-Gomati and Atsufumi Hirohata",

year = "2014",

month = nov,

day = "1",

doi = "10.1109/TMAG.2014.2322912",

language = "English",

volume = "50",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "11",

}

TY - JOUR

T1 - New bandgap measurement technique for a half-metallic ferromagnet

AU - Alhuwaymel, Tariq F.

AU - Abdullah, Ranjdar M.

AU - Whear, Oliver

AU - Huminiuc, Teodor

AU - Carpenter, Robert

AU - El-Gomati, Mohamed

AU - Hirohata, Atsufumi

PY - 2014/11/1

Y1 - 2014/11/1

N2 - In this paper, we report our new optical method for the measurement of the bandgaps of half-metallic ferromagnets (HMFs) that are sensitive to both surface/interface and bulk regions of these ferromagnets depending on the light incident angles and resulting penetration depth. We measured the bandgap of polycrystalline Co2FeSi Heusler alloy thin films at room temperature (RT) as an example. The Co2FeSi thin films were deposited on MgO(001) and Si/SiO2 substrates by sputter deposition. Circularly, polarized infrared light was used to excite the corresponding spin-polarized electrons, which were effectively absorbed by the bandgap of the Co2FeSi Heusler alloy. The Co2FeSi bandgap energy was repeatedly measured and it was found to be ∼ 0.094 eV at RT. This technique allows us to characterize the spin bandgap of HMFs directly.

AB - In this paper, we report our new optical method for the measurement of the bandgaps of half-metallic ferromagnets (HMFs) that are sensitive to both surface/interface and bulk regions of these ferromagnets depending on the light incident angles and resulting penetration depth. We measured the bandgap of polycrystalline Co2FeSi Heusler alloy thin films at room temperature (RT) as an example. The Co2FeSi thin films were deposited on MgO(001) and Si/SiO2 substrates by sputter deposition. Circularly, polarized infrared light was used to excite the corresponding spin-polarized electrons, which were effectively absorbed by the bandgap of the Co2FeSi Heusler alloy. The Co2FeSi bandgap energy was repeatedly measured and it was found to be ∼ 0.094 eV at RT. This technique allows us to characterize the spin bandgap of HMFs directly.

KW - Bandgap measurement

KW - CoFeSi Heusler alloy

KW - half-metallic ferromagnet (HMF)

UR - http://www.scopus.com/inward/record.url?scp=84915748415&partnerID=8YFLogxK

U2 - 10.1109/TMAG.2014.2322912

DO - 10.1109/TMAG.2014.2322912

M3 - Article

AN - SCOPUS:84915748415

SN - 0018-9464

VL - 50

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 11

M1 - 014852504

ER -

New bandgap measurement technique for a half-metallic ferromagnet

Abstract

Keywords

Access to Document

Fingerprint

Cite this