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Autore: Grafiati

Pubblicato: 8 giugno 2024

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1

Mangin, S., M. Gottwald, C.-H. Lambert, D. Steil, V. Uhlíř, L. Pang, M. Hehn et al. "Engineered materials for all-optical helicity-dependent magnetic switching". Nature Materials 13, n. 3 (16 febbraio 2014): 286–92. http://dx.doi.org/10.1038/nmat3864.

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2

El Hadri, Mohammed Salah, Michel Hehn, Grégory Malinowski e Stéphane Mangin. "Materials and devices for all-optical helicity-dependent switching". Journal of Physics D: Applied Physics 50, n. 13 (2 marzo 2017): 133002. http://dx.doi.org/10.1088/1361-6463/aa5adf.

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3

Cheng, Feng, Zhidong Du, Xinjun Wang, Ziqiang Cai, Lin Li, Chuangtang Wang, Abdelkrim Benabbas et al. "All‐Optical Helicity‐Dependent Switching in Hybrid Metal–Ferromagnet Thin Films". Advanced Optical Materials 8, n. 13 (4 maggio 2020): 2000379. http://dx.doi.org/10.1002/adom.202000379.

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4

Zhang, Longlong, e Yuying Hao. "Helicity-dependent all-optical switching based on the self-trapped triplet excitons". Applied Physics Letters 118, n. 9 (1 marzo 2021): 093301. http://dx.doi.org/10.1063/5.0035217.

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5

El Hadri, M. S., P. Pirro, C. H. Lambert, N. Bergeard, S. Petit-Watelot, M. Hehn, G. Malinowski et al. "Electrical characterization of all-optical helicity-dependent switching in ferromagnetic Hall crosses". Applied Physics Letters 108, n. 9 (29 febbraio 2016): 092405. http://dx.doi.org/10.1063/1.4943107.

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6

Schubert, C., A. Hassdenteufel, P. Matthes, J. Schmidt, M. Helm, R. Bratschitsch e M. Albrecht. "All-optical helicity dependent magnetic switching in an artificial zero moment magnet". Applied Physics Letters 104, n. 8 (24 febbraio 2014): 082406. http://dx.doi.org/10.1063/1.4866803.

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7

Jiang, Caijian, Donglin Liu, Xinyu Song, Yifeng Wu, Hai Li e Chudong Xu. "Single-shot all-optical switching of magnetization in TbFe". Journal of Physics D: Applied Physics 57, n. 19 (15 febbraio 2024): 195001. http://dx.doi.org/10.1088/1361-6463/ad26ef.

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Abstract (sommario):

Abstract Thermally induced magnetization switching (TIMS) relying solely on a single laser without any applied magnetic field is a key research direction of current spintronics. Most studies on TbFe so far have focused on helicity-dependent all-optical switching (HD-AOS). In this work, we observe the TIMS on TbFe alloys excited by atomic spin dynamics simulations combined with a two-temperature model. The results show that the magnetization switching of TbFe can be found under certain damping conditions. In addition, we further investigated the reasons why energy density leads to the opposite switching time behavior of Tb and Fe, and our research results also found that changes in damping can affect the concentration and energy density range of the switching, as well as the maximum pulse duration. The dynamic behavior indicates that TbFe switching in 2 ps or less. Our findings widen the basis for fast optical switching of magnetization and break new ground for engineered materials that can be used for nonvolatile ultrafast switching using ultrashort pulses of light.

8

Wang, Sicong, Chen Wei, Yuanhua Feng, Yaoyu Cao, Haiwei Wang, Weiming Cheng, Changsheng Xie et al. "All-optical helicity-dependent magnetic switching by first-order azimuthally polarized vortex beams". Applied Physics Letters 113, n. 17 (22 ottobre 2018): 171108. http://dx.doi.org/10.1063/1.5051576.

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9

Liao, Jung‐Wei, Pierre Vallobra, Liam O'Brien, Unai Atxitia, Victor Raposo, Dorothée Petit, Tarun Vemulkar et al. "Controlling All‐Optical Helicity‐Dependent Switching in Engineered Rare‐Earth Free Synthetic Ferrimagnets". Advanced Science 6, n. 24 (14 ottobre 2019): 1901876. http://dx.doi.org/10.1002/advs.201901876.

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10

Hassdenteufel, Alexander, Birgit Hebler, Christian Schubert, Andreas Liebig, Martin Teich, Manfred Helm, Martin Aeschlimann, Manfred Albrecht e Rudolf Bratschitsch. "Thermally Assisted All-Optical Helicity Dependent Magnetic Switching in Amorphous Fe100-xTbxAlloy Films". Advanced Materials 25, n. 22 (25 aprile 2013): 3122–28. http://dx.doi.org/10.1002/adma.201300176.

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11

Zimnyakova, Polina E., Daria O. Ignatyeva, Andrey N. Kalish, Xiufeng Han e Vladimir I. Belotelov. "Plasmonic dichroism and all-optical magnetization switching in nanophotonic structures with GdFeCo". Optics Letters 47, n. 23 (15 novembre 2022): 6049. http://dx.doi.org/10.1364/ol.472046.

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Abstract (sommario):

We report on a phenomenon of plasmonic dichroism observed in magnetic materials with transverse magnetization under excitation of surface plasmon polariton waves. The effect originates from the interplay of the two magnetization-dependent contributions to the material absorption, both of which are enhanced under plasmon excitation. Plasmonic dichroism is similar to circular magnetic dichroism, which is at the base of all-optical helicity-dependent switching (AO-HDS) but observed for linearly polarized light, and the dichroism acts upon in-plane magnetized films, where AO-HDS does not take place. We show by electromagnetic modeling that laser pulses exciting counter-propagating plasmons can be used to write +M or −M states in a deterministic way independent of the initial magnetization state. The presented approach applies to various ferrimagnetic materials with in-plane magnetization, exhibiting the phenomenon of all-optical switching of a thermal nature and broadens the horizons of their applications in data storage devices.

12

Hassdenteufel, Alexander, Christian Schubert, Birgit Hebler, Helmut Schultheiss, Jürgen Fassbender, Manfred Albrecht e Rudolf Bratschitsch. "All-optical helicity dependent magnetic switching in Tb-Fe thin films with a MHz laser oscillator". Optics Express 22, n. 8 (18 aprile 2014): 10017. http://dx.doi.org/10.1364/oe.22.010017.

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13

Zhang, G. P., T. Latta, Z. Babyak, Y. H. Bai e Thomas F. George. "All-optical spin switching: A new frontier in femtomagnetism — A short review and a simple theory". Modern Physics Letters B 30, n. 21 (10 agosto 2016): 16300052. http://dx.doi.org/10.1142/s0217984916300052.

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Abstract (sommario):

Using an ultrafast laser pulse to manipulate the spin degree of freedom has broad technological appeal. It allows one to control the spin dynamics on a femtosecond time scale. The discipline, commonly called femtomagnetism, started with the pioneering experiment by Beaurepaire and coworkers in 1996, who showed subpicosecond demagnetization occurs in magnetic Ni thin films. This finding has motivated extensive research worldwide. All-optical helicity-dependent spin switching (AO-HDS) represents a new frontier in femtomagnetism, where a single ultrafast laser pulse can permanently switch spin without any assistance from a magnetic field. This review summarizes some of the crucial aspects of this new discipline: key experimental findings, leading mechanisms, controversial issues, and possible future directions. The emphasis is on our latest investigation. We first develop the all-optical spin switching (AOS) rule that determines how the switchability depends on the light helicity. This rule allows one to understand microscopically how the spin is reversed and why the circularly polarized light appears more powerful than the linearly polarized light. Then we invoke our latest spin-orbit coupled harmonic oscillator model to simulate single spin reversal. We consider both continuous wave (cw) excitation and pulsed laser excitation. The results are in a good agreement with the experimental result (a MatLab code is available upon request from the author). We then extend the code to include the exchange interaction among different spin sites. We show where the “inverse-Faraday field” comes from and how the laser affects the spin reversal nonlinearly. Our hope is that this review will motivate new experimental and theoretical investigations and discussions.

14

Raposo, Victor, Rodrigo Guedas, Felipe García-Sánchez, M. Auxiliadora Hernández, Marcelino Zazo e Eduardo Martínez. "Micromagnetic Modeling of All Optical Switching of Ferromagnetic Thin Films: The Role of Inverse Faraday Effect and Magnetic Circular Dichroism". Applied Sciences 10, n. 4 (14 febbraio 2020): 1307. http://dx.doi.org/10.3390/app10041307.

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Abstract (sommario):

There is a lot of experimental evidence of All Optical Switching (AOS) by applying ultrashort laser pulses on ferromagnetic thin films with perpendicular magnetic anisotropy. However, the physical origin behind these processes remains under debate. In addition to the heating caused by the laser pulses, the Inverse Faraday Effect (IFE) and Magnetic Circular Dichroism (MCD) have been proposed as the most probable phenomena responsible for the observations of helicity-dependent AOS. Here, we review the influence of both phenomena by means of realistic micromagnetic simulations based on the Landau–Lifshitz–Bloch equation coupled to the heat transport caused by the laser heating. The analysis allows us to reveal the similarities and differences between both effects. While both mechanisms may lead to the local inversion of the initial magnetic state of a ferromagnetic sample submitted to a train of circularly polarized laser pulses, the Inverse Faraday Effect proves to be more efficient for nucleation and domain wall movement and it reproduces more accurately the different magnetic configurations that the experiments report for different values of the fluence of the laser beam.

15

Xu, Chudong, e Wanjie Xiong. "Role of the heat effect and field effect in single femto-second laser pulse induced helicity-dependent all-optical magnetic switching". Optical Materials Express 8, n. 10 (17 settembre 2018): 3133. http://dx.doi.org/10.1364/ome.8.003133.

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16

Vallobra, P., T. Fache, Y. Xu, L. Zhang, G. Malinowski, M. Hehn, J. C. Rojas-Sánchez, E. E. Fullerton e S. Mangin. "Manipulating exchange bias using all-optical helicity-dependent switching". Physical Review B 96, n. 14 (2 ottobre 2017). http://dx.doi.org/10.1103/physrevb.96.144403.

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17

Khalid, Muhammad Waleed, Jeongho Ha, Mohammed Salah El Hadri, Liyi Hsu, Saeed Hemayat, Yuxuan Xiao, Alexander Sergienko, Eric E. Fullerton e Abdoulaye Ndao. "Meta‐Magnetic All‐Optical Helicity Dependent Switching of Ferromagnetic Thin Films". Advanced Optical Materials, 15 ottobre 2023. http://dx.doi.org/10.1002/adom.202301599.

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Abstract (sommario):

AbstractTo address the ever‐increasing need for higher speed and density of information storage, recent developments in ultrafast optical switching have focused on deterministic control of magnetic properties of materials using femtosecond circularly polarized optical pulses. However, a monolithic high‐speed optical helicity‐dependent switching at room temperature has remained elusive. In recent years, ultra‐thin flat optical structures, known as metasurfaces, have been developed that offer a versatile way to manipulate electromagnetic fields using subwavelength spatial resolution. Here, a monolithic multilayer nanostructure capable of achieving optical helicity‐dependent switching in arbitrary geometries using femtosecond meta‐circularly polarized optical pulses is theoretically described and experimentally demonstrated at room temperature. The proposed monolithic meta‐magnetic platform provides a practical route to reform the current data memory, storage, and information processing technologies in integrated opto‐magnetic systems, holding great promise for cutting‐edge applications in information, spintronics, sensing, and memory storage devices.

18

Chen, Xiang-Jun. "Fundamental mechanism for all-optical helicity-dependent switching of magnetization". Scientific Reports 7, n. 1 (24 gennaio 2017). http://dx.doi.org/10.1038/srep41294.

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19

Cheng, Feng, Chuangtang Wang, Yihao Xu, Wei Ma e Yongmin Liu. "Multiphysics Modeling of Plasmon-Enhanced All-Optical Helicity-Dependent Switching". ACS Photonics, 27 aprile 2023. http://dx.doi.org/10.1021/acsphotonics.2c01815.

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20

Li, Guan-Qi, Xiang-Yu Zheng, Jun-Lin Wang, Xian-Yang Lu, Jing Wu, Jian-Wang Cai, Hao Meng, Bo Liu, Thomas A. Ostler e Yong-Bing Xu. "Timescales and contribution of heating and helicity effect in helicity-dependent all-optical switching". Rare Metals, 22 ottobre 2022. http://dx.doi.org/10.1007/s12598-022-02117-8.

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AbstractThe heating and helicity effects induced by circularly polarized laser excitation are entangled in the helicity-dependent all-optical switching (HD-AOS), which hinders understanding the magnetization dynamics involved. Here, applying a dual-pump laser excitation, first with a linearly polarized (LP) laser pulse followed by a circularly polarized (CP) laser pulse, the timescales and contribution from heating and helicity effects in HD-AOS were identified with a Pt/Co/Pt triple-layer. When the LP laser pulses preheat the sample to a nearly fully demagnetized state, the CP laser pulses with a power reduced by 80% switch the sample’s magnetization. By varying the time delay between the two pump pulses, the results show that the helicity effect, which gives rise to the deterministic helicity-induced switching, arises almost instantly within 200 fs close to the pulse width upon laser excitation. The results reveal that the transient magnetization state upon which CP laser pulses impinge is the key factor for achieving HD-AOS, and importantly, the tunability between heating and helicity effects with the unique dual-pump laser excitation approach will enable HD-AOS in a wide range of magnetic material systems having wide-ranging implications for potential ultrafast spintronics applications. Graphical abstract

21

Hassdenteufel, Alexander, Johannes Schmidt, Christian Schubert, Birgit Hebler, Manfred Helm, Manfred Albrecht e Rudolf Bratschitsch. "Low-remanence criterion for helicity-dependent all-optical magnetic switching in ferrimagnets". Physical Review B 91, n. 10 (30 marzo 2015). http://dx.doi.org/10.1103/physrevb.91.104431.

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22

Yoshikawa, Naotaka, Kazuma Ogawa, Yoshua Hirai, Kohei Fujiwara, Junya Ikeda, Atsushi Tsukazaki e Ryo Shimano. "Non-volatile chirality switching by all-optical magnetization reversal in ferromagnetic Weyl semimetal Co3Sn2S2". Communications Physics 5, n. 1 (20 dicembre 2022). http://dx.doi.org/10.1038/s42005-022-01106-8.

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AbstractWeyl semimetals show unique physical properties exemplified by the colossal anomalous Hall effect, arising from exotic quasiparticles called Weyl fermions emerging around the Weyl nodes. Manipulating these topologically protected Weyl nodes is anticipated to play a leading role towards the on-demand control of quantum properties in Weyl semimetals. We demonstrate non-volatile chirality switching in a ferromagnetic Weyl semimetal Co3Sn2S2 via all-optical magnetization reversal. When excited by circularly polarized mid-infrared light pulses, the sign reversal of the anomalous Hall conductivity stemming from the Berry curvature is observed, manifesting the switching of the chirality of the Weyl nodes accompanying with the magnetization reversal. Magneto-optical imaging measurements reveal that the mechanism of the magnetization/chirality switching is attributed to the helicity-dependent deterministic magnetization associated with the magnetic circular dichroism.

23

Quessab, Y., M. Deb, J. Gorchon, M. Hehn, G. Malinowski e S. Mangin. "Resolving the role of magnetic circular dichroism in multishot helicity-dependent all-optical switching". Physical Review B 100, n. 2 (23 luglio 2019). http://dx.doi.org/10.1103/physrevb.100.024425.

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24

Kichin, G., M. Hehn, J. Gorchon, G. Malinowski, J. Hohlfeld e S. Mangin. "From Multiple- to Single-Pulse All-Optical Helicity-Dependent Switching in Ferromagnetic Co/Pt Multilayers". Physical Review Applied 12, n. 2 (9 agosto 2019). http://dx.doi.org/10.1103/physrevapplied.12.024019.

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25

Yoshikawa, Hiroki, Daiki Tajima, Yuichi Kasatani e Arata Tsukamoto. "Different helicity dependency of in all-optical magnetization switching in GdFeCo films with optical interference layer". Japanese Journal of Applied Physics, 20 settembre 2022. http://dx.doi.org/10.35848/1347-4065/ac9318.

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Abstract (sommario):

Abstract We observe helicity-dependent all-optical magnetization switching (HD-AOS) phenomena in GdFeCo films which have equivalent magnetic properties but different optical properties due to optical interference layer thickness. As a result, we found that these films have different properties of HD-AOS with the duality relation between magnetization direction and light chirality in light absorption which generally means MCD. Therefore, we also evaluated effective absorption of CW laser and intense femtosecond laser pulses. We confirmed the contribution of this duality relation is much smaller in absolute value of absorption, but the contribution of duality relation in absorption can be changed effectively not only the value but also sign in these samples thickness by interference. As a result, we conclude that the duality relation in HD-AOS derive from the duality relation in absorption. And its duality relation can be changed effectively by multiple interference effect.

26

Yamada, Kihiro T., Alexey V. Kimel, Kiran Horabail Prabhakara, Sergiu Ruta, Tian Li, Fuyuki Ando, Sergey Semin, Teruo Ono, Andrei Kirilyuk e Theo Rasing. "Efficient All-Optical Helicity Dependent Switching of Spins in a Pt/Co/Pt Film by a Dual-Pulse Excitation". Frontiers in Nanotechnology 4 (23 febbraio 2022). http://dx.doi.org/10.3389/fnano.2022.765848.

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Abstract (sommario):

All-optical helicity dependent switching (AO-HDS), deterministic control of magnetization by circularly polarized laser pulses, allows to efficiently manipulate spins without the need of a magnetic field. However, AO-HDS in ferromagnetic metals so far requires many laser pulses for fully switching their magnetic states. Using a combination of a short, 90-fs linearly polarized pulse and a subsequent longer, 3-ps circularly polarized pulse, we demonstrate that the number of pulses for full magnetization reversal can be reduced to four pulse pairs in a single stack of Pt/Co/Pt. The obtained results suggest that the dual-pulse approach is a potential route towards realizing efficient AO-HDS in ferromagnetic metals.

27

El Hadri, Mohammed Salah, Michel Hehn, Philipp Pirro, Charles-Henri Lambert, Grégory Malinowski, Eric E. Fullerton e Stéphane Mangin. "Domain size criterion for the observation of all-optical helicity-dependent switching in magnetic thin films". Physical Review B 94, n. 6 (15 agosto 2016). http://dx.doi.org/10.1103/physrevb.94.064419.

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28

Wang, Jian, Yukiko K. Takahashi e Ken-ichi Uchida. "Magneto-optical painting of heat current". Nature Communications 11, n. 1 (7 gennaio 2020). http://dx.doi.org/10.1038/s41467-019-13799-7.

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AbstractActive control of heat flow is crucial for the thermal management of increasingly complex electronic and spintronic devices. In addition to conventional heat transport engineering, spin caloritronics has received extensive attention as a heat control principle owing to its high controllability and unique thermal energy conversion symmetry. Here we demonstrate that the direction of heat currents generated by spin-caloritronic phenomena can be changed simply by illuminating magnetic materials with visible light. The optical control of heat currents is realized through a combination of the spin-driven thermoelectric conversion called an anomalous Ettingshausen effect and all-optical helicity-dependent switching of magnetization. This approach enables not only pinpoint manipulation and flexible design of the heat current distribution by patterning the illuminating light but also on/off control of the resulting temperature modulation by tuning the light polarization. These versatile heat control functionalities will open up a pathway for nanoscale thermal energy engineering.

29

Wang, Chuangtang, Yihao Xu e Yongmin Liu. "Photon Energy‐Dependent Optical Spin‐Orbit Torque in Heavy Metal–Ferromagnet Bilayers". Advanced Functional Materials, 18 ottobre 2023. http://dx.doi.org/10.1002/adfm.202307753.

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AbstractThe manipulation of magnetization through optically generated ultrafast spin currents is a fascinating area that needs a thorough understanding for its potential future applications. In this work, a comprehensive investigation of helicity‐driven optical spin‐orbit torque in heavy metal/ferromagnetic metal heterostructures is presented, specifically cobalt capped with gold or platinum, subject to laser pumping at different wavelengths. The results demonstrate up to tenfold enhancement in optical spin‐orbit torque quantum efficiency for gold compared to platinum of the same thickness when pumped with a visible laser. Additionally, the study provides the first experimental analysis of the photon energy dependence of optical spin‐orbit torque and derives the optical spin orientation spectra for both gold/cobalt and platinum/cobalt heterostructures. A key insight gained from the study is the impact of photon energy‐dependent spin transport in the system, which suggests the use of a high photon energy pump for efficient spin transport. These findings highlight the potential of spin current generation and manipulation in gold/ferromagnet heterostructures for a wide range of applications such as all‐optical magnetization switching, spin‐wave generation and control, and spintronic terahertz emission.

30

Wang, Jian, Asuka Miura, Rajkumar Modak, Yukiko K. Takahashi e Ken-ichi Uchida. "Magneto-optical design of anomalous Nernst thermopile". Scientific Reports 11, n. 1 (27 maggio 2021). http://dx.doi.org/10.1038/s41598-021-90865-5.

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AbstractThe introduction of spin caloritronics into thermoelectric conversion has paved a new path for versatile energy harvesting and heat sensing technologies. In particular, thermoelectric generation based on the anomalous Nernst effect (ANE) is an appealing approach as it shows considerable potential to realize efficient, large-area, and flexible use of heat energy. To make ANE applications viable, not only the improvement of thermoelectric performance but also the simplification of device structures is essential. Here, we demonstrate the construction of an anomalous Nernst thermopile with a substantially enhanced thermoelectric output and simple structure comprising a single ferromagnetic material. These improvements are achieved by combining the ANE with the magneto-optical recording technique called all-optical helicity-dependent switching of magnetization. Our thermopile consists only of Co/Pt multilayer wires arranged in a zigzag configuration, which simplifies microfabrication processes. When the out-of-plane magnetization of the neighboring wires is reversed alternately by local illumination with circularly polarized light, the ANE-induced voltage in the thermopile shows an order of magnitude enhancement, confirming the concept of a magneto-optically designed anomalous Nernst thermopile. The sign of the enhanced ANE-induced voltage can be controlled reversibly by changing the light polarization. The engineering concept demonstrated here promotes effective utilization of the characteristics of the ANE and will contribute to realizing its thermoelectric applications.