Magnon polaron formed by selectively coupled coherent magnon and phonon modes of a surface patterned ferromagnet
Strong coupling between two quanta of different excitations leads to the formation of a hybridized state which paves a way for exploiting new degrees of freedom to control phenomena with high efficiency and precision. A magnon polaron is the hybridized state of a phonon and a magnon, the elementary...
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creator | Godejohann, Felix Scherbakov, Alexey V Kukhtaruk, Serhii M Poddubny, Alexander N Yaremkevich, Dmytro D Wang, Mu Nadzeyka, Achim Yakovlev, Dmitri R Rushforth, Andrew W Akimov, Andrey V Bayer, Manfred |
description | Strong coupling between two quanta of different excitations leads to the formation of a hybridized state which paves a way for exploiting new degrees of freedom to control phenomena with high efficiency and precision. A magnon polaron is the hybridized state of a phonon and a magnon, the elementary quanta of lattice vibrations and spin waves in a magnetically-ordered material. A magnon polaron can be formed at the intersection of the magnon and phonon dispersions, where their frequencies coincide. The observation of magnon polarons in the time domain has remained extremely challenging because the weak interaction of magnons and phonons and their short lifetimes jeopardize the strong coupling required for the formation of a hybridized state. Here, we overcome these limitations by spatial matching of magnons and phonons in a metallic ferromagnet with a nanoscale periodic surface pattern. The spatial overlap of the selected phonon and magnon modes formed in the periodic ferromagnetic structure results in a high coupling strength which, in combination with their long lifetimes allows us to find clear evidence of an optically excited magnon polaron. We show that the symmetries of the localized magnon and phonon states play a crucial role in the magnon polaron formation and its manifestation in the optically excited magnetic transients. |
doi_str_mv | 10.48550/arxiv.1909.01886 |
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A magnon polaron is the hybridized state of a phonon and a magnon, the elementary quanta of lattice vibrations and spin waves in a magnetically-ordered material. A magnon polaron can be formed at the intersection of the magnon and phonon dispersions, where their frequencies coincide. The observation of magnon polarons in the time domain has remained extremely challenging because the weak interaction of magnons and phonons and their short lifetimes jeopardize the strong coupling required for the formation of a hybridized state. Here, we overcome these limitations by spatial matching of magnons and phonons in a metallic ferromagnet with a nanoscale periodic surface pattern. The spatial overlap of the selected phonon and magnon modes formed in the periodic ferromagnetic structure results in a high coupling strength which, in combination with their long lifetimes allows us to find clear evidence of an optically excited magnon polaron. We show that the symmetries of the localized magnon and phonon states play a crucial role in the magnon polaron formation and its manifestation in the optically excited magnetic transients.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.1909.01886</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Coherence ; Ferromagnetism ; Galfenol ; Lattice vibration ; Magnons ; Phonons ; Physics - Materials Science ; Physics - Mesoscale and Nanoscale Physics ; Polarons</subject><ispartof>arXiv.org, 2020-06</ispartof><rights>2020. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). 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A magnon polaron is the hybridized state of a phonon and a magnon, the elementary quanta of lattice vibrations and spin waves in a magnetically-ordered material. A magnon polaron can be formed at the intersection of the magnon and phonon dispersions, where their frequencies coincide. The observation of magnon polarons in the time domain has remained extremely challenging because the weak interaction of magnons and phonons and their short lifetimes jeopardize the strong coupling required for the formation of a hybridized state. Here, we overcome these limitations by spatial matching of magnons and phonons in a metallic ferromagnet with a nanoscale periodic surface pattern. The spatial overlap of the selected phonon and magnon modes formed in the periodic ferromagnetic structure results in a high coupling strength which, in combination with their long lifetimes allows us to find clear evidence of an optically excited magnon polaron. We show that the symmetries of the localized magnon and phonon states play a crucial role in the magnon polaron formation and its manifestation in the optically excited magnetic transients.</description><subject>Coherence</subject><subject>Ferromagnetism</subject><subject>Galfenol</subject><subject>Lattice vibration</subject><subject>Magnons</subject><subject>Phonons</subject><subject>Physics - Materials Science</subject><subject>Physics - Mesoscale and Nanoscale Physics</subject><subject>Polarons</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GOX</sourceid><recordid>eNotkEtrwzAQhEWh0JDmB_RUQc9O9bZ0LKEvSOkld7ORV02CbbmSXZp_XyfpaZbdmWX4CLnjbKms1uwR0u_-Z8kdc0vGrTVXZCak5IVVQtyQRc4HxpgwpdBazkj_AV9d7GgfG0iThpharOn2SDM26If9DzZH6uPYN9Paxx0m7AbaXlLQ1bTfxdPYxhozjYECzWMK4JH2MAyYuikXMKV4yuBwS64DNBkX_zonm5fnzeqtWH--vq-e1gVooQvreZjKs9qAEIGr0mgAQFWjQeMN34IEJVXpuNRW-q0LmnlmrNPOl3o6zcn95e0ZR9WnfQvpWJ2wVGcsk-Ph4uhT_B4xD9UhjqmbOlVCWGWN06WWfxu1Zv4</recordid><startdate>20200622</startdate><enddate>20200622</enddate><creator>Godejohann, Felix</creator><creator>Scherbakov, Alexey V</creator><creator>Kukhtaruk, Serhii M</creator><creator>Poddubny, Alexander N</creator><creator>Yaremkevich, Dmytro D</creator><creator>Wang, Mu</creator><creator>Nadzeyka, Achim</creator><creator>Yakovlev, Dmitri R</creator><creator>Rushforth, Andrew W</creator><creator>Akimov, Andrey V</creator><creator>Bayer, Manfred</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20200622</creationdate><title>Magnon polaron formed by selectively coupled coherent magnon and phonon modes of a surface patterned ferromagnet</title><author>Godejohann, Felix ; Scherbakov, Alexey V ; Kukhtaruk, Serhii M ; Poddubny, Alexander N ; Yaremkevich, Dmytro D ; Wang, Mu ; Nadzeyka, Achim ; Yakovlev, Dmitri R ; Rushforth, Andrew W ; Akimov, Andrey V ; Bayer, Manfred</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a525-8c1f1880d6a22f14765aaae4de6e6c61ba3a4347913583cb9f50c068959c75a43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Coherence</topic><topic>Ferromagnetism</topic><topic>Galfenol</topic><topic>Lattice vibration</topic><topic>Magnons</topic><topic>Phonons</topic><topic>Physics - Materials Science</topic><topic>Physics - Mesoscale and Nanoscale Physics</topic><topic>Polarons</topic><toplevel>online_resources</toplevel><creatorcontrib>Godejohann, Felix</creatorcontrib><creatorcontrib>Scherbakov, Alexey V</creatorcontrib><creatorcontrib>Kukhtaruk, Serhii M</creatorcontrib><creatorcontrib>Poddubny, Alexander N</creatorcontrib><creatorcontrib>Yaremkevich, Dmytro D</creatorcontrib><creatorcontrib>Wang, Mu</creatorcontrib><creatorcontrib>Nadzeyka, Achim</creatorcontrib><creatorcontrib>Yakovlev, Dmitri R</creatorcontrib><creatorcontrib>Rushforth, Andrew W</creatorcontrib><creatorcontrib>Akimov, Andrey V</creatorcontrib><creatorcontrib>Bayer, Manfred</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Access via ProQuest (Open Access)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>arXiv.org</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Godejohann, Felix</au><au>Scherbakov, Alexey V</au><au>Kukhtaruk, Serhii M</au><au>Poddubny, Alexander N</au><au>Yaremkevich, Dmytro D</au><au>Wang, Mu</au><au>Nadzeyka, Achim</au><au>Yakovlev, Dmitri R</au><au>Rushforth, Andrew W</au><au>Akimov, Andrey V</au><au>Bayer, Manfred</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Magnon polaron formed by selectively coupled coherent magnon and phonon modes of a surface patterned ferromagnet</atitle><jtitle>arXiv.org</jtitle><date>2020-06-22</date><risdate>2020</risdate><eissn>2331-8422</eissn><abstract>Strong coupling between two quanta of different excitations leads to the formation of a hybridized state which paves a way for exploiting new degrees of freedom to control phenomena with high efficiency and precision. A magnon polaron is the hybridized state of a phonon and a magnon, the elementary quanta of lattice vibrations and spin waves in a magnetically-ordered material. A magnon polaron can be formed at the intersection of the magnon and phonon dispersions, where their frequencies coincide. The observation of magnon polarons in the time domain has remained extremely challenging because the weak interaction of magnons and phonons and their short lifetimes jeopardize the strong coupling required for the formation of a hybridized state. Here, we overcome these limitations by spatial matching of magnons and phonons in a metallic ferromagnet with a nanoscale periodic surface pattern. The spatial overlap of the selected phonon and magnon modes formed in the periodic ferromagnetic structure results in a high coupling strength which, in combination with their long lifetimes allows us to find clear evidence of an optically excited magnon polaron. 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subjects | Coherence Ferromagnetism Galfenol Lattice vibration Magnons Phonons Physics - Materials Science Physics - Mesoscale and Nanoscale Physics Polarons |
title | Magnon polaron formed by selectively coupled coherent magnon and phonon modes of a surface patterned ferromagnet |
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