Ferrimagnetic order in the mixed garnet (Y1−xGdx)3Fe5O12

Yamagishi, Takumi; Awaka, Junji; Kawashima, Y.; Uemura, Masahiko; Ebisu, Shuji; Chikazawa, Susumu; Nagata, Satoshi

doi:10.1080/09500830500038092

Cited by 32 publications

(19 citation statements)

References 14 publications

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“…GdIG has the same iron garnet crystal structure, with a third magnetic sublattice (3 dodecahedrally coordinated Gd 3+ ions per formula unit), which is ferromagnetically coupled to the FeA sublattice. The strong variation of the magnetization of the Gd sublattice with temperature makes GdIG a compensated ferrimagnet, with the magnetization dominated by the Gd and FeA sublattices below room temperature 43,45,69 . We hypothesize that the perfect epitaxy of the crystal structure at the YIG/GdIG interface ( Fig.…”

Section: Iiic X-ray Magnetic Circular Dichroism Measurementsmentioning

confidence: 99%

Synthetic Antiferromagnetic Coupling Between Ultrathin Insulating Garnets

et al. 2018

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The use of magnetic insulators is attracting a lot of interest due to a rich variety of spindependent phenomena with potential applications to spintronic devices. Here we report ultrathin yttrium iron garnet (YIG) / gadolinium iron garnet (GdIG) insulating bilayers on gadolinium iron garnet (GGG). From spin Hall magnetoresistance (SMR) and X-ray magnetic circular dichroism measurements, we show that the YIG and GdIG magnetically couple antiparallel even in moderate in-plane magnetic fields. The results demonstrate an allinsulating equivalent of a synthetic antiferromagnet in a garnet-based thin film heterostructure and could open new venues for insulators in magnetic devices. As an example, we demonstrate a memory element with orthogonal magnetization switching that can be read by SMR.

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Section: Iiic X-ray Magnetic Circular Dichroism Measurementsmentioning

confidence: 99%

Synthetic Antiferromagnetic Coupling Between Ultrathin Insulating Garnets

et al. 2018

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“…For all the inductance measurements, the strength of the applied magnetic field was no more than H 0 ∼ 3 A/m, estimated from the current flowing in the toroid windings. This is much smaller than the ferrite's saturation field (H 0 ∼ 10 5 A/m) [17], which ensures that we always measure the initial susceptibility of the material.…”

Section: Methodsmentioning

confidence: 99%

Magnetic susceptibility and magnetization fluctuation measurements of mixed gadolinium-yttrium iron garnets

2009

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We study the magnetic properties of gadolinium-yttrium iron garnet ͑Gd x Y 3−x Fe 5 O 12 , x =3,1.8͒ ferrite ceramics. The complex initial permeability is measured in the temperature range of 2-295 K at frequency of 1 kHz and in the frequency range of 100 Hz-200 MHz at temperatures of 4, 77, and 295 K. The magnetic viscosity-induced imaginary part of the permeability is observed at low frequencies. Measurements of the magnetization noise are made at 4 K. Using the fluctuation-dissipation theorem, we find that the observed magnetization fluctuations are consistent with our measurements of the low-frequency imaginary part of the permeability. We discuss some implications for proposed precision measurements as well as other possible applications.

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“…In previous work we investigated the ferromagnetic order in the mixed garnet (Y 1-x Gd x ) 3 Fe 5 O 12 system [17]. An enlargement of coercive force H c in the hysteresis loop for the low-field M-H curve is clearly observed in near T comp [17].…”

Section: Introductionmentioning

confidence: 94%

“…An enlargement of coercive force H c in the hysteresis loop for the low-field M-H curve is clearly observed in near T comp [17]. The coercive force H c is defined as that value of magnetizing field that causes the magnetization of the specimen to be zero.…”

Section: Introductionmentioning

confidence: 96%

A double peak of the coercive force near the compensation temperature in the rare earth iron garnets

Uemura

Yamagishi

Ebisu

et al. 2008

Philosophical Magazine

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The behaviour of the coercive force, H c , of ferrimagnets near the compensation temperature, T comp , for polycrystalline rare earth iron garnets R 3 Fe 5 O 12 (R ¼ Gd, Tb, Dy, Ho and Er) has been studied in detail. The present experimental results have verified the double peak in H c near T comp for these rare earth iron garnets R 3 Fe 5 O 12 . For Dy 3 Fe 5 O 12 , the experimental values are T comp ¼ 224 K, H c (max) ¼ 600 Oe at T comp AE K and % 10 K. The two peaks of H c arise at 214 and 232 K. The appearance of the double peak of H c is an intrinsic and characteristic property for R 3 Fe 5 O 12 . The results can be understood on the basis of a simple model. The hysteresis loop in the magnetization is caused by rotation of single domain under the influence of crystalline anisotropy rather than domain wall displacements of the multi-domain structure. The rare earth ion behaves as superimposed paraprocess under the influence of an internal field produced by iron sublattices and a weak exchange magnetic field.

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Ferrimagnetic order in the mixed garnet (Y₁₋_xGd_x)₃Fe₅O₁₂

Cited by 32 publications

References 14 publications

Synthetic Antiferromagnetic Coupling Between Ultrathin Insulating Garnets

Synthetic Antiferromagnetic Coupling Between Ultrathin Insulating Garnets

Magnetic susceptibility and magnetization fluctuation measurements of mixed gadolinium-yttrium iron garnets

A double peak of the coercive force near the compensation temperature in the rare earth iron garnets

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