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Ultrafast magnetization dynamics in FeCo thin films with varied stoichiometry.

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Title: Ultrafast magnetization dynamics in FeCo thin films with varied stoichiometry.
Authors: Bozdag, Tugce1,2 (AUTHOR), Unlu, Bekir Asilcan1,2 (AUTHOR), Arslan, Metin1 (AUTHOR), Kavak, Eyup1,2 (AUTHOR), Duman, Eyup2,3 (AUTHOR) eduman@eng.ankara.edu.tr, Yaglioglu, Halime Gul2,3 (AUTHOR) yoglu@eng.ankara.edu.tr
Source: Applied Physics B: Lasers & Optics. Mar2026, Vol. 132 Issue 3, p1-9. 9p.
Subjects: Demagnetization, Magnetic films, Magnetic relaxation, Kerr magneto-optical effect, Magnetic control, Magnetization reversal
Abstract: Despite the fact that numerous experiments have been conducted on a variety of magnetic materials, further research is necessary on the ultrafast magnetization dynamics of other magnetic materials. This is not only to understand the mechanism behind ultrafast demagnetization, but also to identify suitable materials for a range of applications. In this regards, FeCo alloys offers research possibility due to their high magnetic moment, low Gilbert damping factor, tunable Curie temperature and moderate composition-dependent spin–orbit coupling strength. In this work, time-resolved magneto optic Kerr effect (TR-MOKE) experimental techniques and three temperature model (3TM) analysis were used to investigate how compositional tuning affects the efficiency of demagnetization and it's time scales. We found that, the demagnetization time for FeCo thin films, obtained by fitting the experimental TR-MOKE data to the analytical solution of 3TM, were ranging between 300 and 500 fs. Those values are slower than that of other transition metals. This observation was attributed to the low Gilbert damping factor value of the investigated FeCo thin films. Moreover, the values of both and were increased with increasing fluence values. It can be concluded from these two observations that the underlying mechanism responsible for the ultrafast demagnetization in FeCo thin films is predominantly governed by the spin–flip process. Additionaly, experimental results along with their theoretical analysis revealed that, although altering composition of FeCo thin films affect ultrafast demagnetization time profile slightly, it changes demagnetization efficiency significantly, which is one of the important parameters for ultrafast switching applications. Therefore, it can be concluded that among the investigated thin films Fe Co have the potential to be utilised in ultrafast switching applications. [ABSTRACT FROM AUTHOR]
Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 192432796
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  Data: Ultrafast magnetization dynamics in FeCo thin films with varied stoichiometry.
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  Data: <searchLink fieldCode="AR" term="%22Bozdag%2C+Tugce%22">Bozdag, Tugce</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Unlu%2C+Bekir+Asilcan%22">Unlu, Bekir Asilcan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Arslan%2C+Metin%22">Arslan, Metin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kavak%2C+Eyup%22">Kavak, Eyup</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Duman%2C+Eyup%22">Duman, Eyup</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<i> eduman@eng.ankara.edu.tr</i><br /><searchLink fieldCode="AR" term="%22Yaglioglu%2C+Halime+Gul%22">Yaglioglu, Halime Gul</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<i> yoglu@eng.ankara.edu.tr</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Physics+B%3A+Lasers+%26+Optics%22">Applied Physics B: Lasers & Optics</searchLink>. Mar2026, Vol. 132 Issue 3, p1-9. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Demagnetization%22">Demagnetization</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+films%22">Magnetic films</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+relaxation%22">Magnetic relaxation</searchLink><br /><searchLink fieldCode="DE" term="%22Kerr+magneto-optical+effect%22">Kerr magneto-optical effect</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+control%22">Magnetic control</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetization+reversal%22">Magnetization reversal</searchLink>
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  Data: Despite the fact that numerous experiments have been conducted on a variety of magnetic materials, further research is necessary on the ultrafast magnetization dynamics of other magnetic materials. This is not only to understand the mechanism behind ultrafast demagnetization, but also to identify suitable materials for a range of applications. In this regards, FeCo alloys offers research possibility due to their high magnetic moment, low Gilbert damping factor, tunable Curie temperature and moderate composition-dependent spin–orbit coupling strength. In this work, time-resolved magneto optic Kerr effect (TR-MOKE) experimental techniques and three temperature model (3TM) analysis were used to investigate how compositional tuning affects the efficiency of demagnetization and it's time scales. We found that, the demagnetization time for FeCo thin films, obtained by fitting the experimental TR-MOKE data to the analytical solution of 3TM, were ranging between 300 and 500 fs. Those values are slower than that of other transition metals. This observation was attributed to the low Gilbert damping factor value of the investigated FeCo thin films. Moreover, the values of both and were increased with increasing fluence values. It can be concluded from these two observations that the underlying mechanism responsible for the ultrafast demagnetization in FeCo thin films is predominantly governed by the spin–flip process. Additionaly, experimental results along with their theoretical analysis revealed that, although altering composition of FeCo thin films affect ultrafast demagnetization time profile slightly, it changes demagnetization efficiency significantly, which is one of the important parameters for ultrafast switching applications. Therefore, it can be concluded that among the investigated thin films Fe Co have the potential to be utilised in ultrafast switching applications. [ABSTRACT FROM AUTHOR]
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  Group: Ab
  Data: <i>Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Magnetic relaxation
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      – SubjectFull: Magnetic control
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      – SubjectFull: Magnetization reversal
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      – TitleFull: Ultrafast magnetization dynamics in FeCo thin films with varied stoichiometry.
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              Text: Mar2026
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