Photomagnetic effects

Enz, U.; Lems, W.; Metselaar, R Ruud; Rijnierse, P. J.; Teale, R W

doi:10.1109/tmag.1969.1066522

Cited by 40 publications

(12 citation statements)

References 13 publications

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“…In that case, the increase of the coercivity was inferred to be caused by the electron charge-transfer induced by light illumination. 27 The B-implanted sample presents a slope change in the temperature dependence of the coercivity (inset of Figure 5), which is consistent with thermal processes becoming active with increasing temperature. We note that charge transfer enhanced coercivity has been reported in other systems.…”

supporting

confidence: 67%

“…The increase of temperature will lead to an increase of the charge-transfer as a result of the increase of the thermal energy, and thus, the coercivity increases. This explanation can be supported by the work of Enz et al, 27 who have observed a significant increase of the coercivity in the magnetically soft Si-doped Yttrium Iron Garnet (Y 3 Fe 6-x Si x O 12 ) upon illumination. In that case, the increase of the coercivity was inferred to be caused by the electron charge-transfer induced by light illumination.…”

mentioning

confidence: 64%

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Origin of the anomalous temperature dependence of coercivity in soft ferromagnets

Moubah

Ahlberg

Zamani

et al. 2014

Journal of Applied Physics

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We report on the origin of the anomalous temperature dependence of coercivity observed in some soft ferromagnets by studying the magnetic and electronic properties of FeZr films doped using ion implantation by H, He, B, C, and N. The anomalous increase of the coercivity with temperature was observed only in the C- and B-doped samples. Using x-ray photoelectron spectroscopy, we show that the anomalous behavior of the coercivity coincides with the occurrence of an electron charge transfer for those implanted samples. The origin of the anomaly is discussed in terms of (i) magnetic softness, (ii) nature of the Fe-C and -B covalent bonds, and (iii) large charge transfer

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supporting

confidence: 67%

mentioning

confidence: 64%

Origin of the anomalous temperature dependence of coercivity in soft ferromagnets

Moubah

Ahlberg

Zamani

et al. 2014

Journal of Applied Physics

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“…The simplest approach to cope with the large variety of crystallographically different Fe2+ centers [25][26][27] which are, in fact, induced in Y IG : Me4+ is to assume one kind of the octahedral Fe2+ centers. Then the Fe2+ sites may differ only in the relative orientation of the local axis system.…”

Section: Preliminary Calculationsmentioning

confidence: 99%

“…The qualitative two-center model [25,26] assumes an existence of two clearly distinguishable Fe2+ centers in YIG:Me4+: (i) a "near" center being close to the inducing Me4+ ion and (ii) a "far" center located at much larger distance from the Me4+ ion. A local distortion around a near center must obviously be stronger than that around a far center.…”

Section: Outline Of the Modelmentioning

confidence: 99%

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On the Mechanism of Spin Reorientation in YIG:Si

Rudowicz

1984

Zeitschrift Für Naturforschung A

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The magnetocrystalline anisotropy theory developed earlier by us and based on a novel energy level model for Fe2~ in YIG:Si(Ge) is used here to study the mechanism of spin reorientation in YIG:Si. Single-ion anisotropy with a uniform distribution of Fe2+ ions indicate a broad spin reorientation which turns out to be due to the higher-order cubic terms K} and KA. It is found that the completion temperature (T2) of the spin reorientation is strongly influenced by Ka thus indicating an inadequacy of the approach based on Kx, K2 and K3 only. From the single Fe-+ ion anisotropy results we propose a two-center model which implies a new mechanism of the spin reorientation in YIG: Si. The bulk onset (77) and completion (T2) temperatures are linked to the relative number (a) of the near Fe2+ sites. Spin orientation diagrams in the plane a -T are established for the total Fe2+-Fe3+ system for a wide range of the parameters involved. The two-center model accounts well for the bulk experimental temperatures T[ and T2 in YIG: Si and for the absence of spin reorientation in samples having Si-content less than 0.18. The total magnetization M is predicted not to rotate smoothly between the [100] and [111] direction. There exists an upper critical angle beyond which M switches sharply to [111] as the temperature approaches T2. Comparison with the previous model which requires a nonuniform distribution of Fe2+ ions is also discussed.

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Photoinduced Broadening of Ferrimagnetic Resonance in Polycrystalline YIG:Mn

Hisatake

Hirasaki

1975

Phys. Stat. Sol. (a)

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Photomagnetic effects

Cited by 40 publications

References 13 publications

Origin of the anomalous temperature dependence of coercivity in soft ferromagnets

Origin of the anomalous temperature dependence of coercivity in soft ferromagnets

On the Mechanism of Spin Reorientation in YIG:Si

Photoinduced Broadening of Ferrimagnetic Resonance in Polycrystalline YIG:Mn

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