Ultrafast Dynamics of Demagnetization in FeMn/MnGa Bilayer Nanofilm Structures via Phonon Transport.
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| Title: | Ultrafast Dynamics of Demagnetization in FeMn/MnGa Bilayer Nanofilm Structures via Phonon Transport. |
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| Authors: | Jiang, Tianran1 (AUTHOR), Zhao, Xupeng2 (AUTHOR), Chen, Zhifeng3 (AUTHOR), You, Yongyong1 (AUTHOR), Lai, Tianshu1 (AUTHOR) stslts@mail.sysu.edu.cn, Zhao, Jianhua2 (AUTHOR) stslts@mail.sysu.edu.cn |
| Source: | Nanomaterials (2079-4991). Nov2022, Vol. 12 Issue 22, p4088. 12p. |
| Subjects: | Kerr magneto-optical effect, Demagnetization, Phonons, Magnetic structure, Molecular beam epitaxy, Bilayer lipid membranes |
| Abstract: | Superdiffusive spin transport has been proposed as a new mechanism of ultrafast demagnetization in layered magnetic nanostructures and demonstrated experimentally. However, it is unknown if it is possible for phonon transport to occur and manipulate ultrafast demagnetization. Here, we explore the ultrafast dynamics of demagnetization of an antiferromagnet/ferromagnet bilayer nanostructure, of a FeMn/MnGa bilayer film prepared by molecular beam epitaxy. Ultrafast dynamics of a two-step demagnetization were observed through the time-resolved magneto-optical Kerr effect. The first-step fast component of the two-step demagnetization occurred within ~200 fs, while the second-step slow component emerged in a few tens of picoseconds. For a single MnGa film, only the ultrafast dynamics of the first-step fast demagnetization were observed, revealing that the second-step slow demagnetization originates from interlayer phonon transport. A four-temperature model considering phonon transport was developed and used to effectively reproduce the observed ultrafast dynamics of two-step demagnetization. Our results reveal the effect of phonon transport on demagnetization for the first time and open up a new route to manipulate ultrafast demagnetization in layered magnetic structures. [ABSTRACT FROM AUTHOR] |
| Copyright of Nanomaterials (2079-4991) is the property of MDPI 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.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 160465736 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Ultrafast Dynamics of Demagnetization in FeMn/MnGa Bilayer Nanofilm Structures via Phonon Transport. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Jiang%2C+Tianran%22">Jiang, Tianran</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhao%2C+Xupeng%22">Zhao, Xupeng</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Zhifeng%22">Chen, Zhifeng</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22You%2C+Yongyong%22">You, Yongyong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lai%2C+Tianshu%22">Lai, Tianshu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> stslts@mail.sysu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhao%2C+Jianhua%22">Zhao, Jianhua</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> stslts@mail.sysu.edu.cn</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Nov2022, Vol. 12 Issue 22, p4088. 12p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Kerr+magneto-optical+effect%22">Kerr magneto-optical effect</searchLink><br /><searchLink fieldCode="DE" term="%22Demagnetization%22">Demagnetization</searchLink><br /><searchLink fieldCode="DE" term="%22Phonons%22">Phonons</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+structure%22">Magnetic structure</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+beam+epitaxy%22">Molecular beam epitaxy</searchLink><br /><searchLink fieldCode="DE" term="%22Bilayer+lipid+membranes%22">Bilayer lipid membranes</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Superdiffusive spin transport has been proposed as a new mechanism of ultrafast demagnetization in layered magnetic nanostructures and demonstrated experimentally. However, it is unknown if it is possible for phonon transport to occur and manipulate ultrafast demagnetization. Here, we explore the ultrafast dynamics of demagnetization of an antiferromagnet/ferromagnet bilayer nanostructure, of a FeMn/MnGa bilayer film prepared by molecular beam epitaxy. Ultrafast dynamics of a two-step demagnetization were observed through the time-resolved magneto-optical Kerr effect. The first-step fast component of the two-step demagnetization occurred within ~200 fs, while the second-step slow component emerged in a few tens of picoseconds. For a single MnGa film, only the ultrafast dynamics of the first-step fast demagnetization were observed, revealing that the second-step slow demagnetization originates from interlayer phonon transport. A four-temperature model considering phonon transport was developed and used to effectively reproduce the observed ultrafast dynamics of two-step demagnetization. Our results reveal the effect of phonon transport on demagnetization for the first time and open up a new route to manipulate ultrafast demagnetization in layered magnetic structures. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI 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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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/nano12224088 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 4088 Subjects: – SubjectFull: Kerr magneto-optical effect Type: general – SubjectFull: Demagnetization Type: general – SubjectFull: Phonons Type: general – SubjectFull: Magnetic structure Type: general – SubjectFull: Molecular beam epitaxy Type: general – SubjectFull: Bilayer lipid membranes Type: general Titles: – TitleFull: Ultrafast Dynamics of Demagnetization in FeMn/MnGa Bilayer Nanofilm Structures via Phonon Transport. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Jiang, Tianran – PersonEntity: Name: NameFull: Zhao, Xupeng – PersonEntity: Name: NameFull: Chen, Zhifeng – PersonEntity: Name: NameFull: You, Yongyong – PersonEntity: Name: NameFull: Lai, Tianshu – PersonEntity: Name: NameFull: Zhao, Jianhua IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 11 Text: Nov2022 Type: published Y: 2022 Identifiers: – Type: issn-print Value: 20794991 Numbering: – Type: volume Value: 12 – Type: issue Value: 22 Titles: – TitleFull: Nanomaterials (2079-4991) Type: main |
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