Intrinsic coercive force of rare earth iron garnets near the compensation temperature

Hanton, J. P.

doi:10.1109/tmag.1967.1066116

Cited by 19 publications

(6 citation statements)

References 5 publications

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“…[ 45,46 ] Furthermore, this increase in coercive field does not approach infinity if the rare‐earth sublattice is unsaturated. [ 47 ] Above compensation temperature, the coercivity decreases as it scales inversely with effective saturation magnetization. Still, the room temperature coercivity is large due to the low saturation magnetization that significantly reduces the demagnetization energy.…”

Section: Resultsmentioning

confidence: 99%

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Interfacial and Bulk Magnetic Properties of Stoichiometric Cerium Doped Terbium Iron Garnet Polycrystalline Thin Films

Srinivasan

Radu

Bilardello

et al. 2020

Adv Funct Materials

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One of the best magneto-optical claddings for optical isolators in photonic integrated circuits is sputter deposited cerium-doped terbium iron garnet (Ce:TbIG) which has a large Faraday rotation (≈−3500° cm −1 at 1550 nm). Near-ideal stoichiometryCe Tb Fe 0.57 + + = =       of Ce 0.5 Tb 2.5 Fe 4.75 O 12 is found to have a 44 nm magnetic dead layer that can impede the interaction of propagating modes with garnet claddings. The effective anisotropy of Ce:TbIG on Si is also important, but calculations using bulk thermal mismatch overestimate the effective anisotropy. X-ray diffraction measurements yield highly accurate measurements of strain that show anisotropy favors an in-plane magnetization in agreement with the positive magnetostriction of Ce:TbIG. Upon doping TbIG with Ce, a slight decrease in compensation temperature occurs which points to preferential rare-earth occupation in dodecahedral sites and an absence of cation redistribution between different lattice sites. The high Faraday rotation, large remanent ratio, large coercivity, and preferential in-plane magnetization enable Ce:TbIG to be an in-plane latched garnet, immune to stray fields with magnetization collinear to direction of light propagation.

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Section: Resultsmentioning

confidence: 99%

“…Large magnetization reversal fields can be attributed to a spin‐glass state where reversal is dominated by rotation of frozen moments rather than conventional domain wall motion. [ 47,51 ]…”

Section: Resultsmentioning

confidence: 99%

Interfacial and Bulk Magnetic Properties of Stoichiometric Cerium Doped Terbium Iron Garnet Polycrystalline Thin Films

Srinivasan

Radu

Bilardello

et al. 2020

Adv Funct Materials

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“…With approximately 1:2 Gd:Yb, T c ≈ 77 K. An advantage to use of such a material is that the sample magnetization is very small, reducing some possible systematic effects [17]. On the other hand the coercive field is roughly given by H c = 250/(|T c /T − 1| + 1) Oe for polycrystalline GdYIG and the increase near T c is due to the low B for a given H when the magnetization of the material is small; this describes the primary dependence of H c on T and the composition [18]. Another interesting point is that the hysteresis loop becomes very square near T c ; this is attributed to the domains being very large when the magnetization of the sample is small [19,20].…”

Section: Methodsmentioning

confidence: 99%

Solid-state systems for the electron electric dipole moment and other fundamental measurements

Lamoreaux

2002

Phys. Rev. A

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In 1968, F.L. Shapiro published the suggestion that one could search for an electron EDM by applying a strong electric field to a substance that has an unpaired electron spin; at low temperature, the EDM interaction would lead to a net sample magnetization that can be detected with a SQUID magnetometer. One experimental EDM search based on this technique was published, and for a number of reasons including high sample conductivity, high operating temperature, and limited SQUID technology, the result was not particularly sensitive compared to other experiments in the late 1970's.Advances in SQUID and conventional magnetometery had led us to reconsider this type of experiment, which can be extended to searches and tests other than EDMs (e.g., test of Lorentz invariance). In addition, the complementary measurement of an EDM-induced sample electric polarization due to application of a magnetic field to a paramagnetic sample might be effective using modern ultrasensitive charge measurement techniques. A possible paramagnetic material is Gd-substituted YIG which has very low conductivity and a net enhancement (atomic enhancement times crystal screening) of order unity. Use of a reasonable volume (100's of cc) sample of this material at 50 mK and 10 kV/cm might yield an electron EDM sensitivity of 10 −32 e cm or better, a factor of 10 5 improvement over current experimental limits.

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“…The large difference in the experimental values of coercivity observed for bulk and nanosized forms suggests that the assumption of the singleedomain state near T comp in bulks may be an idealized concept. In [11], via the investigation of coercivity as a function [27] and [28] for bulk samples may also be due to the fact that the maximum applied fields used in these studies were not large enough to create the full loop states. At low temperature range far apart from the peak region, an increasing tendency of H c with deceasing temperature is observed which is mostly originated from the increase of magnetocrystalline anisotropy as a result of the ordering of the rare-earth sublattice.…”

Section: Magnetic Coercivity H Cmentioning

confidence: 99%

Crystallization and magnetic characterizations of DyIG and HoIG nanopowders fabricated using citrate sol-gel

Nguyet

Duong

Satoh

et al. 2016

Journal of Science: Advanced Materials and Devices

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a b s t r a c tDy and Ho iron garnets in form of nanoparticles were synthesized by citrate sol-gel method. Phase formation, lattice constant and average crystallite sizes of the samples were determined via XRD measurements. Morphology and particle size distribution were studied by TEM and chemical composition was checked by EDX. Magnetic measurements in temperature range 5e600 K and in the maximum applied field of 50 kOe were carried out by using SQUID and VSM. Their magnetic parameters, including Curie temperature, magnetization compensation temperature, spontaneous magnetization, high-field susceptibility, magnetic coercivity were discussed in the framework of three interacting magnetic sublattices, magnetocrystalline anisotropy, core-shell model and compared to those of the bulk materials. Based on these analyses further evaluation on the crystallinity and homogeneity of the samples has been made.

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Intrinsic coercive force of rare earth iron garnets near the compensation temperature

Cited by 19 publications

References 5 publications

Interfacial and Bulk Magnetic Properties of Stoichiometric Cerium Doped Terbium Iron Garnet Polycrystalline Thin Films

Interfacial and Bulk Magnetic Properties of Stoichiometric Cerium Doped Terbium Iron Garnet Polycrystalline Thin Films

Solid-state systems for the electron electric dipole moment and other fundamental measurements

Crystallization and magnetic characterizations of DyIG and HoIG nanopowders fabricated using citrate sol-gel

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