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  • 1
    Electronic Resource
    Electronic Resource
    Temperature dependence of domain-wall coercive field in magnetic garnet films (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 3462-3466 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The coercive properties of magnetically uniaxial liquid-phase epitaxy garnet films were investigated between 10 K and the Néel temperature (TN≤500 K). Two independent methods, the results of which are nearly identical (magnetical response of oscillating domain walls and the method of coercive loops measured in a vibrating sample magnetometer), were used. Besides the usual domain-wall coercive field, Hdw, the critical coercive pressure, pdw, was also introduced as it describes in a direct way the interactions of the domain walls with the wall-pinning traps. Both Hdw and pdw were found to increase exponentially with decreasing temperature. Three different types of wall-pinning traps were identified in the sample and their strength, their rate of change with temperature, and their temperature range of activity were determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350946
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of the switching properties of a regular 2D array of Preisach-type particles (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5854-5854 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The original Preisach model of magnetic hysteresis assumes an assembly of single domain particles, each having a rectangular hysteresis loop. The loops are characterized by up and down switching fields. The halfwidth of the loop is the coercivity Hc of the given particle. The loops might be shifted depending on the magnetic state of the environment, described by an effective interaction field, Hi. In the present work the switching properties of an artificially structured, highly uniaxial, magneto-optic garnet film (courtesy of R. Belt, AIRTRON), corresponding to the assumptions of the original Preisach model, are investigated. In this case the parameter identification is straightforward. The garnet film is etched into 42 μm rectangular pixels, separated by 15 μm grooves. Each pixel has a rectangular hysteresis loop. Up and down magnetized pixels give a black and white contrast due to Faraday effect. Magnetization can be measured by counting the number of pixels switched in a given field. The distribution of the coercive field has been obtained by measuring individual loops on each of several hundred pixels in an optical magnetometer. The average Hc=265±99 Oe, Hi=0±26 Oe. The interaction field has been measured on the same pixel, depending on the magnetization state of the nearest neighbor pixels. The contribution to Hi of oppositely magnetized pixels is dHi/dn=26 Oe/pixel. These data are compared to macroscopic hysteresis loops measured in VSM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353550
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  • 3
    Electronic Resource
    Electronic Resource
    Modifying the temperature dependence of magnetic garnet film coercivity by etching (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 6322-6326 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the domain-wall coercive field of epitaxial magnetic garnet films was modified in a defined temperature range by removing the surface layer of the films. Outside the given temperature range the coercivity versus temperature curve did not change. The result supports a model of coercivity according to which different sets of material imperfections are responsible for pinning the domain walls in different temperature regions. Appropriate processing of the samples enables some of the pinning sets to be modified independently of each other. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371733
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  • 4
    Electronic Resource
    Electronic Resource
    Survey of the dependence on temperature of the coercivity of garnet films (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 6426-6431 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the domain-wall coercive field of epitaxial magnetic garnets films has been investigated in the entire temperature range of the ferrimagnetic phase, and has been found to be described by a set of parametric exponents. In subsequent temperature regions different slopes were observed, with breaking points whose position was found to be sample dependent. A survey based on literature data as well as on a large number of our own samples shows the general existence of this piecewise exponential dependence and the presence of the breaking points. This type of domain-wall coercive field temperature dependence was found in all samples in the large family of the epitaxial garnets (about 30 specimens of more than ten chemical compositions) and also in another strongly anisotropic material (TbFeCo). © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359116
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  • 5
    Electronic Resource
    Electronic Resource
    Photomagnetism in Ca2+Fe4+-doped yttrium iron garnet (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3110-3112 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature and time dependence of the initial susceptibility of the optical magnetization curve has been measured on epitaxial films of nominally pure yttrium iron garnet (YIG) and Ca: YIG, during illumination with white light after cooling in the dark. Depending on sample composition, the maximum temperature for the occurrence of the light-induced effects on the susceptibility is 100 K〈T〈150 K. The change to the low-susceptibility state by light excitation is a three-step process. The first process is characterized by time constants of the order of minutes, during the second process the susceptibility does not change, and finally, at 93 K after 4 h of illumination by 15 mW/cm2 light intensity the susceptibility of Ca0.11:YIG is observed to decrease to a saturation value in less than an hour. After turning off the light the susceptibility remains constant for about an hour, then increases with a similar time dependence. No light-induced effects were detected in YIG over the same range of temperature, time, or light intensity. The results are interpreted in terms of light excitation of holes from the tetrahedral Fe4+ sites nearest to the Ca2+ impurity first to orientationally inequivalent sites on the same coordination sphere, then to nonmagnetic centers with intermediate energies, and finally to the next-nearest tetrahedral Fe3+ sites of higher anisotropy energy. The energy difference between the two states is measured to be in the 3–10-meV range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340858
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  • 6
    Electronic Resource
    Electronic Resource
    Temperature dependence of coercivity of epitaxial magnetic garnet films (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3827-3832 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the coercivity Hc, magnetization, anisotropy, and domain wall energy was measured for SmGaYIG, SmCaGeYIG, and SmLuCaGeYIG epitaxial bubble garnet films from 100 K up to the Néel temperature TN(approximately-greater-than)400 K. Data were analyzed together with results published on similar samples on the basis of the theory of domain wall pinning by a random array of uniform defects and a good fit was observed in the form of H1/2c=H1/20 −CT2/3, where H0 and C are constants. The maximum average interaction force between defects and walls is 2.9×10−7 dyne, corresponding to the minimum interaction range equal to the wall width. The density of defects is in the range between 1014 and 1016 cm−3. The size and number of defects derived from the temperature dependence of Hc is in agreement with the microstructure of epitaxial garnets revealed by transmission electron microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335598
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  • 7
    Electronic Resource
    Electronic Resource
    Sample size effect in coercivity measurement of epitaxial magnetic garnet films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 1694-1700 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The full set of characteristic parameters of epitaxial garnet films was measured as a function of the sample size from about 2000 to 5 mm2. The type of domain structure, width of the stripe domain period, characteristic material length, domain wall energy, and anisotropy did not change within the error of measurement on reducing the sample size. The bubble domain collapse field decreased by about 2.5%, and the domain wall coercivity was measured and found to have decreased—almost by an order of magnitude. The experiments showed the lack of dependence of coercivity on the domain wall length. The coercivity and collapse field are suggested as being related to the sample dimensions via the sample-size-dependent derivatives of the total free energy with respect to the domain wall positions. The assumption of the direct effect of the free energy derivatives on the coercivity is supported by a model experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339904
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of ion implantation on stripe- and bubble-domain coercivity (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 2119-2124 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The static coercivity of stripe and bubble domains in 5-μm (YSmCa)3(FeGe)5O12 epitaxial garnet films was measured by the oscillating-wall method. The dependence of coercivity on Ne+ implantation energy and dosage was investigated. In a wide range of energy and dosage, implantation was found to eliminate hard bubbles and decrease bubble coercivity by 25%; the decrease is a measure of the contribution of Bloch lines to coercivity. The average number of Bloch lines n in bubble walls was determined from static coercivity as 37≤n≤62, n increasing with quality factor Q. Bubble coercivity was always found to be higher than stripe coercivity measured by the same method. Implantation has no measurable effect on apparent stripe coercivity which may be a consequence of the lower Bloch line density of stripes relative to bubbles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337018
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  • 9
    Electronic Resource
    Electronic Resource
    A Preisach model study of demagnetized states
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 104-107 (1992), S. 313-314 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(92)90812-3
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  • 10
    Electronic Resource
    Electronic Resource
    Contactless temperature switch using amorphous ribbons
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 102 (1991), S. 135-138 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(91)90278-I
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