γ-ray induced change of the initial permeability in yttrium iron garnet at 77 K

Hisatake, K.; Matsubara, I.; Maeda, Kei‐ichiro; Fujihara, T.; Suzuki, Shigehiko; Wakao, Hiromi; Higashi, Tomomitsu; Uematsu, K.

doi:10.1002/pssa.2211130272

Cited by 3 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reason why the lowered p / and enhanced p 11 may persist at the 2nd run even above each of the turning temperature is not clear, although one of the authors(l.M) has given a tentative explanation. As in a previous paper [10] , we proposed here also that the peak of DA at the Iow temperature could be induced by the short range order of mobile Vo without trapped electrons. A mobility of V () can be thought in order of value as Vo i (i=O,le,2e), indicating the number of electrons trapped at the V 0' since they form the discrete and sharp shape as a function of temperature [ll].…”

Section: Ill Experimental Results and Discussionsupporting

confidence: 68%

Mechanism of Photoinduced Disaccommodation in Yttrium Iron Garnet

et al. 1998

Self Cite

View full text Add to dashboard Cite

In single crystals of yttrium iron garnet irradiated with an intense visible light at 77 K, a remarkable change of the temperature dependence of complex permeabilities It' and tt' is observed. Simultaneously, conspicuous double peaks of photoinduced disaccommodation, DA around 130 K(DA(I» and 200 K (DA(II))\vere found,with correlative onset of the irreversible decrease of It' at low temperature. Activation energies of these peaks are estimated 0.46 eV for DA(I) and 0.7 eV for DA(II). In addition, we observed the third peak(DAIlI, 0.88 e V), independent of irradiation around the room temperature. For an explanation of these results, a simple model is presented here for explaining these results.

show abstract

Section: Ill Experimental Results and Discussionsupporting

confidence: 68%

Mechanism of Photoinduced Disaccommodation in Yttrium Iron Garnet

et al. 1998

Self Cite

View full text Add to dashboard Cite

show abstract

“…The concaves of permeabilities versus temperature curves(l25 K and 200K) were ascribed to photoinduced DA which was confumed by using the automatic DA tester. In several samples, an additional DA peak independent of irradiation is observed around room temperature, the reason of which may be ascribed to oxygen vacancy with double electrons trapped [5]. These results are interpreted within the context of configuration coordinate(CC) diagrams with large lattice relaxations [6].…”

Section: Journal De Physique IVmentioning

confidence: 67%

Thermal Hysteresis of Photoinduced Magnetic Effect in Yttrium Iron Garnet

et al. 1997

Self Cite

View full text Add to dashboard Cite

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

show abstract

“…The magnetic permeability in YIG changes not only owing to light but also owing to Xand y-radiation and as a result of electron bombardment [34, 172 to 1741.…”

Section: Resultsmentioning

confidence: 99%

Photoinduced Magnetism and Conduction Electrons in Magnetic Semiconductors

Nagaev¹

1988

Physica Status Solidi (b)

View full text Add to dashboard Cite

MnF, antiferromagnetic system by plane-polarized light through excitation of excitons in one of the two equivalent sublattices in the AFM was the subject of an outstanding experimental study [6]. A great amount of experimental work has been carried out2) with the aim of verifying and analyzing in detail the above-mentioned effects. Basic Principles of the Magnetic Semiconductor Theory Temperature dependence of the energy spectiqum of conduction electrons in ferromagnetic systemsThe theory of magnetic semiconductors is based on the s-f model (below the differences between localized d-and f-electrons are disregarded). With charge carriers having the same sign, the Hamiltonian for this model in the nearest-neighbour approximation has the following form:The first term in (2.1) describes the conduction electrons; g is the dimensionless coordinate of the atom, A the vector connecting the nearest neighbours, (T the spin projection. The second term describes the exchange interaction between conduction electrons and localized magnetic moments; here, Sg is the operator of the localized magnetic moment for the g atom, so,, are the Pauli matrices. The third term describes the "direct" (more precisely, the superexchange) interaction between localized magnetic moments which determines the type of magnetic ordering in the crystal. For certainly, the lattice of magnetic atoms is considered to be simple cubic.Magnetic semiconductors can be classified according t o the magnitude of the parameter ASIW, where S is the magnitude of the localized spin of the atom, W the conduction band width. Among semiconductors with a wide conduction band ( W > > A S ) are, e.g., EuO and EuS ferromagnets and EuTe and EuSe antiferromagnets.Among semiconductors with a narrow conduction band are, e.g., ferromagnetic spinels CdCr,Se, and others [74]. A theory of narrow-band magnetic semiconductors was described in detail earlier [63]. Below we shall analyze the results as applied to semiconductors with wide conduction bands. Qualitatively, in both cases the physical picture is the same, but if W > AX a more detailed analysis is possible [75, 2031.

show abstract

γ-ray induced change of the initial permeability in yttrium iron garnet at 77 K

Cited by 3 publications

References 12 publications

Mechanism of Photoinduced Disaccommodation in Yttrium Iron Garnet

Mechanism of Photoinduced Disaccommodation in Yttrium Iron Garnet

Thermal Hysteresis of Photoinduced Magnetic Effect in Yttrium Iron Garnet

Photoinduced Magnetism and Conduction Electrons in Magnetic Semiconductors

Contact Info

Product

Resources

About