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All-garnet magneto-optical photonic crystals
KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.
KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och tillämpad fysik, MAP.ORCID-id: 0000-0001-8774-9302
2008 (engelsk)Inngår i: Journal of the Magnetics Society of Japan, ISSN 1882-2924, Vol. 32, nr 2, s. 140-145Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We survey the properties of all-garnet magneto-optical (MO) heteroepitaxial film structures grown by pulsed laser deposition and rf-magnetron sputtering. 1D MO-photonic crystals (MOPCs) were composed of /4 garnet layers alternating highly gyrotropic B13Fe5O12 (BIG) and MO-passive rare earth gallium garnets. As designed, MOPCs' spectra exhibit optical stop band with the transmittance central peak caused by light localization in /2 thick BIG cavity. The first all-garnet BIG/YIG MOPC showed 140% enhancement of the Faraday rotation (FR) compared to a single layer BIG film [APL 84, 1438 (2004)]. Further improvement of MO-performance has been achieved due to the replacement of optically dense YIG by transparent Gd- (GGG), Sm- and novel La-Ga-garnets [APL 86, 141108 (2005); 87, 122504 (2005); 90, 191113 (2007); JAP 101, 053906 (2007)]. At the resonance wavelengths 750 (980) nm, specific FR F=-20.5 (-7.3) deg/m and MO-quality factor Q = 2 |F| /absorption = 66 (43.6) deg represent the highest MOPC performance achieved so far. Respectively, this is 470 (810) % and 31 (190)% enhancement compared to a single layer BIG. MO-remanence (latching capability) has been engineered in the series of BIG:GGG(n:m) superlattices. Regular alternating of lattice mismatched garnet layers impedes the nucleation of misfit dislocations, preserves a long range coherent compressive strain through the whole multilayer thickness thus results in a strong uniaxial magnetic anisotropy. 2.5 m thick BIG:GGG(3:2) film at 678 nm shows FR=1.4 deg, transmittance 82%, 92% squareness of magnetization loop, saturation and coercive fields as low as 56 and 25 Oe, respectively. Nanostructured garnets were used to build MO-visualizer and current driven MO-display [APL 88, 242504 (2006)].

sted, utgiver, år, opplag, sider
Japan, 2008. Vol. 32, nr 2, s. 140-145
Emneord [en]
bismuth compounds, coercive force, compressive strength, dislocations, Faraday effect, gadolinium compounds, light transmission, magnetic anisotropy, magnetic epitaxial layers, nucleation, photonic crystals, pulsed laser deposition, sputter deposition, transparency
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Identifikatorer
URN: urn:nbn:se:kth:diva-59898OAI: oai:DiVA.org:kth-59898DiVA, id: diva2:476624
Forskningsfinansiär
Swedish Research Council
Merknad

Bi3Fe5O12-Gd3Ga5O12. QC 20120120

Tilgjengelig fra: 2012-01-12 Laget: 2012-01-12 Sist oppdatert: 2016-12-15bibliografisk kontrollert

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Khartsev, Sergiy

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