Faraday Rotation in Rare-Earth Iron Garnets

Crossley, W. A.; Cooper, R. W.; Page, J. L.; Stapele, R. P. van

doi:10.1063/1.1657740

Cited by 19 publications

(15 citation statements)

References 7 publications

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“…As magnetic insulators, rare-earth iron garnets (R 3 Fe 5 O 12 ) or RIG constitute an important class of materials, which are promising for technological applications such as magnetic recording devices with giant magnetorestriction 1 , spin Seebeck insulators for thermoelectric generation 2 , microwave devices based on currentinduced spin torque resonance 3 , and Faraday rotators in optical telecommunications 4 . These systems are known to have two different types of Fe ions, namely experiencing a tetrahedral versus octahedral coordination environment ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Properties of rare-earth iron garnets from first principles

Nakamoto

et al. 2017

Phys. Rev. B

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Structural and magnetic properties of rare-earth iron garnets (RIG), which contain 160 atoms per unit cell, are systematically investigated for rare-earth elements varying from La to Lu (and including Y), by performing spin polarized density-functional calculations. The effects of 4f electrons (as core or as valence electrons) on the lattice constant, internal coordinates and bond lengths are found to be rather small, with these predicted structural properties agreeing rather well with available experiments. On the other hand, treating such electrons as valence electrons is essential to interpret the total magnetization measured in some RIG at low temperature, the different orientation and magnitude of the magnetizations that Fe and rare-earth ions can adopt and to also explain why some RIG have a compensation temperature while others do not. The magnetic exchange couplings and orbital-projected density of states are also reported for two representative materials, namely Gd3Fe5O12 and Nd3Fe5O12, when accounting for their 4f electrons.

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Section: Introductionmentioning

confidence: 99%

Properties of rare-earth iron garnets from first principles

Nakamoto

et al. 2017

Phys. Rev. B

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“…we will show that (TbBi)3FeS012 and ('!bLaBi)3FeS012 films are exllent in temperature charactaristics for an optical isolator at both 1.3 f.i.m and 0.8 f.i.m wavelength regions. (7), [8] In addition w= report the results of rreasurerrents of their saturation magnetization and optical transparency which are important characteristics for an optical isolator.…”

Section: Ini'roductionmentioning

confidence: 99%

“…SS,urn wavelength, and its FTC was found to be 10%. [7], [ 8 ] ,....... Both Curie temperature and the effect of a host rare-earth are considered to be factors which determine the temperature dependence of BF for Bi-substituted iron garnets.…”

Section: Lpe Grcwi'hmentioning

confidence: 99%

“…BF of 'lbIG has a positive value above compensation terrperature (2S0K), decreases with increasing terrperature and shows a steep temperature dependence of 8 F around room terrperature. [7] Judging from the terrperature dependence of 8 F for a variety of Bi-substituted rare-earth iron garnets, 8 F : B iIG is of negative sign and its absolute value is assumed to decrease with increase in as terrperature: drastically around Curie temperature. [10] Therefore 8 F (T) of Bi-substituted TbIG is expected to have a small terrperature dependence around the room terrperature but to decrease in low terrperature region and around Curie temperature.…”

Section: Lpe Grcwi'hmentioning

confidence: 99%

“…7. SUMMARY Tb3-XBiXFeS012 with various X values and Tb2.2LaO.2BiO.6FeS012 films were prepared by LPE method and their Faraday rotation terrperature coefficients were measured at 1.3,urn and 0.78 ,urn wavelength.…”

Section: Lpe Grcwi'hmentioning

confidence: 99%

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TEMPERATURE DEPENDENCE OF FARADAY ROTATION FOR Bi-SUBSTITUTED Tb IRON GARNET FILMS

1987

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Temperature dependence of Faraday rotation, which causes degradation of isolation at high or low temperature for an optical isolator, was rreasured at 1. 3,um and 0.78,um wavelength together with saturation magnetization and optical transparency for epitaxially grown (TbBi)3FeS012 and ('!bLaBi) 3FeS012 films. Tenperature dependence of faraday rotation for these films w=re smaller than those for (GdBi)3(FeAlGa)S012 films and (GdBi)3FeS012 bulk single crystals.Particularly, thick '!b2.2LaO.2BiO 6FeS012 films show=d less than O.S% sift in Faraday rotation in the temperature range from 0 to ~OoC. Additionally '!b 2 2LaO.2BiO 6FeS012 films had a small saturation magnetization, carpared with Y3FeS012 and sufficient optical transparency in 1.3 ~ 1.S ,urn wavelength for an optical isolator. INI'RODUCTIONBi-substituted rare-earth iron garnets, (RBi)3FeS012' with large Faraday rotation grown by liquid-phase epitaxial (LPE) and flux rrethods have been utilized to replace the conventional YIG (Y3FeS012) single crystals for an optical isolator used in near infrared region. (1),[21 Especially the LPE grown thick films, e.g. (GdBi)3(FeAlGa)S012, excel in productivitity and have realized supply of materials for an optical isolator at low prices. [3] How=ver the temperature dependence of Faraday rotation 9 F of Bi-substituted iron garnet utilizing Gd as a host rare-earth is larger than that of YIG and caused a problem of isolation degradation at higher or low=r temperature when applied to an optical isolator.By employing (DyBi)3FeS012 the temperature dependence of 9 F was improved up to the level of YIG. How=ver r since (DyBi) 1FeS012 has optical absorption peaks around 1. 3 ,urn wavelength, this material is practical for optical isolator used in the 1. S f.i.m band but not in the 1.3 f.i.m band.(4] Although double-layered LPE garnet films or combination of two LPE films with different temperature dependence of 9 F w=re proposed to obtain a flat temperature dependence of 8 F for Bi-sbstituted iron garnet. a single layer LPE film with flat temperature dependence of 8 F has not yet been reported.[SJ, [6] Here w= report the temperature dependence of 9 F for (TbBi)3FeS012' that is a solid solution of hypothetical BiIG and '!bIG which has no optical absorption peaks by rare-earth in the wavelength range from O. B to 1. S f.i.m , and for (TbLaBi) 3FeS012' that is prepared by La OOping to the above solid solution. we will show that (TbBi)3FeS012 and ('!bLaBi)3FeS012 films are exllent in temperature charactaristics for an optical isolator at both 1.3 f.i.m and 0.8 f.i.m wavelength regions.(7), [8] In addition w= report the results of rreasurerrents of their saturation magnetization and optical transparency which are important characteristics for an optical isolator. LPE GRCWI'HTb3-XBiXFes012 (X ~ 0.68-vl.18), Tb2.2LaO.2BiO.6FeS012 and TbIG (Tb 3 Fe S o 12 )films w=re grown by iso-thermal horizontal dipping rrethod on non-magnetic garnet substrates, as snown in Table 1. In order to get further impro~errent of temperature dlipend...

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Magneto-optics of ferrites

Wettling

1976

Journal of Magnetism and Magnetic Materials

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Faraday Rotation in Rare-Earth Iron Garnets

Cited by 19 publications

References 7 publications

Properties of rare-earth iron garnets from first principles

Properties of rare-earth iron garnets from first principles

TEMPERATURE DEPENDENCE OF FARADAY ROTATION FOR Bi-SUBSTITUTED Tb IRON GARNET FILMS

Magneto-optics of ferrites

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