Manipulation of the magneto-optical properties of a Co/C heterostructure under an applied voltage

Hsu, Hua-Shu; Chang, Y. Y.; Huang, Jing-Ya; Huang, Ya-Huei; Liao, Yen Fa; Lee, Jian-Shing; Sun, Shih-Jye; Yao, Y. D.

doi:10.1016/j.carbon.2018.08.030

Cited by 6 publications

(2 citation statements)

References 35 publications

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“…In addition, due to the electronic transitions of the spin-polarized density of states (DOSs) of the Co, the CD effect can be initially detected under a low photon energy excitation (i.e., infrared light). 33 The amplitude of MCD was tunable through variation in the applied magnetic field H. As the field surpassed 0.1 T and the photon energy (E) of light excitation was below 3 eV, the MCD value remained almost constant. Notably, when the field was reduced to 0T, broadband CD was observed, which suggests that our Co/ ZnO NWs had a remnant CD.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Broadband positive MCD signals were observable between the near-infrared and UV spectra in the positive magnetic field (Figure A), which is related to the band structure of the metallic Co with no band gap. In addition, due to the electronic transitions of the spin-polarized density of states (DOSs) of the Co, the CD effect can be initially detected under a low photon energy excitation (i.e., infrared light) . The amplitude of MCD was tunable through variation in the applied magnetic field H .…”

Section: Resultsmentioning

confidence: 99%

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Field-Free Magnetoplasmon-Induced Ultraviolet Circular Dichroism Switching in Premagnetized Magnetic Nanowires

Lin

Chen

Sun

et al. 2022

ACS Appl. Mater. Interfaces

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Broadband modulation of magnetic circular dichroism (MCD) using a relatively low magnetic field or by producing a field-free magnetoplasmonic effect in the remnant magnetic state was achieved by the integration of the noble metals (NMs) Au and Ag and the perpendicular magnetic anisotropy of Co with ZnO nanowires (NWs) used as the template. The samples containing NMs revealed MCD sign reversals and enhancements when compared with the original Co/ZnO NWs. The magnetoplasmonic effect of Au close to the visible light spectrum could induce the CD change in the visible region. Notably, the ultraviolet (UV) CD in Ag/Co/ZnO NWs is 12.5 times larger under a magnetic field (∼0.2 T) and 10 times greater in the remnant state (field-free) than those of the original Co/ZnO NWs because of the magnetoplasmonic effect of Ag in the UV spectrum. These results are attributable to the coupling of the remnant magnetic state of Co magnetization, the magnetoplasmons of the NMs, and the excitons of the ZnO NWs. The findings are potentially applicable in magneto-optical recording, biosensing, and energy contexts involving magnetoplasmonic functionalization.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Field-Free Magnetoplasmon-Induced Ultraviolet Circular Dichroism Switching in Premagnetized Magnetic Nanowires

Lin

Chen

Sun

et al. 2022

ACS Appl. Mater. Interfaces

Self Cite

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Volatile and Non‐Volatile Dual‐Function Electrically Controlled Ultraviolet Magneto‐Optical Effect in TmIG/Pt

Chien,

Liu,

Lin

et al. 2024

Adv Elect Materials

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This research demonstrates dynamic control of the magneto‐optical properties in Tm3Fe5O12 (TmIG)/Pt by employing electrical current modulation, particularly within the UV spectrum. Notably, manipulation of circular dichroism (CD) is achieved in perpendicularly magnetized TmIG without an external magnetic field. Furthermore, by carefully managing the magnetization behavior of TmIG through low current control and introducing a moderate external magnetic field, the reversible inversion of the CD signal in TmIG is successfully demonstrated, offering nonvolatile control. It is proposed that the change in CD signal arises from the temperature gradient induced by Joule heating, resulting in a spin current flowing across the TmIG. Moreover, the theoretical framework confirms that spin alignment transitions occur between O(2p) and Fe(3d), as well as between O(2p) and Tm(5d), under the influence of the Tm(4f) moment. This leads to a transition from a collinear to a noncollinear spin configuration, effectively suppressing pd Laporte‐selected relaxation within TmIG. This discovery opens the path for the development of dynamic, large‐area, and ultrathin chiral optical devices using magnetic insulators.

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Manipulation of the magnetoabsorption effect in Co-coated ZnO nanowires with Au decoration

Hsu

Lin

et al. 2019

Applied Surface Science

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Manipulation of the magneto-optical properties of a Co/C heterostructure under an applied voltage

Cited by 6 publications

References 35 publications

Field-Free Magnetoplasmon-Induced Ultraviolet Circular Dichroism Switching in Premagnetized Magnetic Nanowires

Field-Free Magnetoplasmon-Induced Ultraviolet Circular Dichroism Switching in Premagnetized Magnetic Nanowires

Volatile and Non‐Volatile Dual‐Function Electrically Controlled Ultraviolet Magneto‐Optical Effect in TmIG/Pt

Manipulation of the magnetoabsorption effect in Co-coated ZnO nanowires with Au decoration

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