High-temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchange
Magnetically induced ferroelectric multiferroics present an exciting new paradigm in the design of multifunctional materials, by intimately coupling magnetic and polar order. Magnetoelectricity creates a novel quasiparticle excitation--the electromagnon--at terahertz frequencies, with spectral signa...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Springer Nature
2014
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| _version_ | 1797069021205495808 |
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| author | Jones, S Gaw, S Doig, K Prabhakaran, D Hétroy Wheeler, E Boothroyd, A Lloyd-Hughes, J |
| author_facet | Jones, S Gaw, S Doig, K Prabhakaran, D Hétroy Wheeler, E Boothroyd, A Lloyd-Hughes, J |
| author_sort | Jones, S |
| collection | OXFORD |
| description | Magnetically induced ferroelectric multiferroics present an exciting new paradigm in the design of multifunctional materials, by intimately coupling magnetic and polar order. Magnetoelectricity creates a novel quasiparticle excitation--the electromagnon--at terahertz frequencies, with spectral signatures that unveil important spin interactions. To date, electromagnons have been discovered at low temperature (<70 K) and predominantly in rare-earth compounds such as RMnO3. Here we demonstrate using terahertz time-domain spectroscopy that intersublattice exchange in the improper multiferroic cupric oxide (CuO) creates electromagnons at substantially elevated temperatures (213-230 K). Dynamic magnetoelectric coupling can therefore be achieved in materials, such as CuO, that exhibit minimal static cross-coupling. The electromagnon strength and energy track the static polarization, highlighting the importance of the underlying cycloidal spin structure. Polarized neutron scattering and terahertz spectroscopy identify a magnon in the antiferromagnetic ground state, with a temperature dependence that suggests a significant role for biquadratic exchange. |
| first_indexed | 2024-03-06T22:18:27Z |
| format | Journal article |
| id | oxford-uuid:54346d07-d727-4078-9ca1-c5234037af34 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:18:27Z |
| publishDate | 2014 |
| publisher | Springer Nature |
| record_format | dspace |
| spelling | oxford-uuid:54346d07-d727-4078-9ca1-c5234037af342022-03-26T16:36:21ZHigh-temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchangeJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:54346d07-d727-4078-9ca1-c5234037af34EnglishSymplectic Elements at OxfordSpringer Nature2014Jones, SGaw, SDoig, KPrabhakaran, DHétroy Wheeler, EBoothroyd, ALloyd-Hughes, JMagnetically induced ferroelectric multiferroics present an exciting new paradigm in the design of multifunctional materials, by intimately coupling magnetic and polar order. Magnetoelectricity creates a novel quasiparticle excitation--the electromagnon--at terahertz frequencies, with spectral signatures that unveil important spin interactions. To date, electromagnons have been discovered at low temperature (<70 K) and predominantly in rare-earth compounds such as RMnO3. Here we demonstrate using terahertz time-domain spectroscopy that intersublattice exchange in the improper multiferroic cupric oxide (CuO) creates electromagnons at substantially elevated temperatures (213-230 K). Dynamic magnetoelectric coupling can therefore be achieved in materials, such as CuO, that exhibit minimal static cross-coupling. The electromagnon strength and energy track the static polarization, highlighting the importance of the underlying cycloidal spin structure. Polarized neutron scattering and terahertz spectroscopy identify a magnon in the antiferromagnetic ground state, with a temperature dependence that suggests a significant role for biquadratic exchange. |
| spellingShingle | Jones, S Gaw, S Doig, K Prabhakaran, D Hétroy Wheeler, E Boothroyd, A Lloyd-Hughes, J High-temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchange |
| title | High-temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchange |
| title_full | High-temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchange |
| title_fullStr | High-temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchange |
| title_full_unstemmed | High-temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchange |
| title_short | High-temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchange |
| title_sort | high temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchange |
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