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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic transitions at high fields in (Fe,Mn)3Si alloys : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6359-6361 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the series of ordered DO3 solid solutions Fe3−xMnxSi, field-induced transitions have previously been found to occur for antiferromagnetic alloys with values of x near 1.70. The present work has determined a region of composition in which antiferromagnetism is the low-field, low-temperature state and gives the variation of the critical field as a function of temperature and composition. The critical field decreases approximately quadratically with temperature and rises to beyond 6 T in the range of composition from 1.6≤x≤1.8. Neutron diffraction indicates that the antiferromagnetic axis is shifted from the [111] direction and that in a 5 T field the antiferromagnetic component of the scattering is reduced considerably from that in zero field. However, no corresponding increase in ferromagnetic component is observed within experimental error and Arrott plots suggest the high-field state is still largely antiferromagnetic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358266
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  • 2
    Electronic Resource
    Electronic Resource
    Self-channeling of magnetostatic waves in ferromagnetic film (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5630-5630 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low power magnetostatic wave (MSW) experiments reporting beam formation and propagation inside ferromagnetic films have been carried out .1,2 In this work, we report the first observation of self channeling of MSW and the formation of the spatial solitons of MSW for an in-plane magnetized YIG film and waves propagating perpendicularly to the direction of magnetization. The experiments were conducted using YIG film of 4.9 μm thickness magnetized in-plane by a permanent magnetic field of 1094 Oe. A cw signal was launched into the film through a microstrip antenna. A Brillouin scattering system consisting of a tandem Fabry–Perot interferometer has been used to observe the profile of a MSW beam. Self-channeling MSW beam propagation occurring as a result of an interplay between diffraction of the beam and self-modulation was observed for various magnitudes of input power and initial frequency. At low power levels the formed MSW beam broadens and weakens during the propagation. As the input power increases, the intensity of the peak power of the beam also increases and a narrow channel of the MSW beam is formed. The power threshold depends on the wavelength of MSW and the width of the excitation microstrip. A theory describing the spatial MSW self-channeling is developed. The necessary and sufficient conditions are analyzed and numerical calculations are provided. The experimental data are in a semi-quantitative agreement with theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355665
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic phase transitions in (Fe1−xTx)3Ga4 alloys (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 4879-4881 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic ordering in the series of transition metal alloys (Fe1−xTx)3Ga4 with T=Ni and Ti having values of x in the range 0.05≤x≤0.20 has been investigated at high fields and low temperatures. Magnetization measurements revealed that in contrast to other T substitutions, Ni and Ti induce completely different types of effects on the magnetic properties. In the case of Ni substitution a ferrimagnetic-like type of magnetic order is induced at low compositions and low temperatures and Ti produces a ferromagnetic ground state. For Ti alloys with low composition as the temperature is increased a field induced transition starts to appear at about 50 K which persists up to room temperature suggesting a phase transition from a ferromagnetic to an antiferromagnetic state. The phase diagrams of the Ni and Ti system are explainable in terms of the Moriya-Usami and Isoda theories. Preliminary neutron diffraction measurements on the Ni alloys carried out at ILL suggest the existence of short-range order over a certain temperature range. The behavior observed so far on the various substituted systems leads us to believe that there is a clear relation between the magnetic properties and the relative position of the substitution element with respect to Fe in the Periodic Table. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373189
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  • 4
    Electronic Resource
    Electronic Resource
    Preludes to spin-wave chaos: Spin-wave instability processes, butterfly curves, kinks, flips, cusps, and shifts (invited) (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5401-5401 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Manifestations of chaos1–3 above the threshold microwave field for spin-wave instability have brought this established topic in microwave magnetics back into vogue. This paper will review the nature of the instability onset and the factors which determine the variation of the threshold microwave field for instability (hcrit) with dc field, the so-called "butterfly curve.'' A key factor here is the wave-vector k dependence of the spin-wave linewidth ΔHk. This k dependence leads to abrupt shifts in the wave number k for the unstable modes from large values (105 cm−1) to small values (103 cm−1) and a characteristic "kink'' in the subsidiary absorption butterfly curve. Under certain circumstances, flips in the aximuthal spin-wave propagation angle are also predicted. Such flips show up experimentally in some of the expected circumstances, but not in others.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342382
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  • 5
    Electronic Resource
    Electronic Resource
    Light-scattering observation of anomalous parametric spin-wave character in subsidiary absorption (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5477-5479 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The technique of Brillouin light scattering has been used for the characterization, in terms of wave number and direction of propagation, of parametric spin waves associated with subsidiary absorption in thin films of yttrium iron garnet. Measurements at 7.99, 8.47, and 9.90 GHz have revealed a spin-wave character consistent with theory, with two notable exceptions. First, the data show no evidence for a predicted flip in the azimuthal propagation angle. Second, the measured magnon wave numbers at high fields are inconsistent with the theoretical values. The wave number and polar angle results imply that the change to low-k spin waves is not a discontinuous transition as indicated by the model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342524
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  • 6
    Electronic Resource
    Electronic Resource
    Brillouin light scattering detection of ferromagnetic resonance in thin films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3344-3346 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ferromagnetic resonance (FMR) in thin films of permalloy and yttrium iron garnet (YIG) has been studied by Brillouin light scattering (BLS) techniques. The measurements were made at 9.4 GHz on 22.4 to 75-nm-thick permalloy films and on 2.1- to 12.8-μm-thick YIG films. Intensity profiles for magnon scattered light versus in-plane applied field were obtained by analyzing the forward scattered light through the films with a high-contrast Fabry–Perot interferometer. The BLS profiles show a signal-to-noise ratio of 10-100 for the permalloy and 100-1000 for the YIG films, depending on the film thickness and the microwave power level. The FMR BLS response was quantified in terms of global response function, counts/s mW versus magnon occupation number Nu. The Nu parameter relates the scattering to the uniform mode FMR response (linewidth, field, frequency, etc.), input microwave power, and active sample volume. The response for permalloy was approximately10−8 counts/s mW magnon, which translates into a limiting sample volume of 10−12 cm3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340802
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  • 7
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of some Co(AlMn) alloys (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4243-4245 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization, magnetic susceptibility, and neutron diffraction measurements have been made on the alloy series CoAl1−xMnx over a wide range of temperature for 0〈x〈0.4. In this range of concentration the alloys retain the singly ordered B2 (CsCl) structure and neutron diffraction results suggest that the Mn atoms predominantly enter Al sites. However, at concentrations less than x=0.15 about 1% of Mn atoms may possibly enter Co sites with consequent displacement of Co atoms to Al sites. All the alloys show ferromagnetic behavior with Curie temperatures up to 675 K. Evidence for the coexistence of superparamagnetism is found indicating some clusters may not be coupled to the infinite cluster. The superparamagnetism persists to a limited extent above the Curie temperatures for most of the alloys and conventional analysis suggests cluster moments of ∼1000μB for x=0.1 for example. At high temperatures Curie–Weiss behavior is consistent with a moment of ∼0.4μB per formula unit with a composition independent Curie constant suggesting an itinerant origin for the ferromagnetism. Low field (10 Oe or less) magnetization measurements have also been performed for x=0.1 and 0.2. There is a significant difference between zero-field cooled and field-cooled curves at low temperatures indicating a freezing at ∼80 K for x=0.1 and ∼15 K for x=0.2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338487
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  • 8
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of Co(AlV) alloys (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5271-5273 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization and magnetic susceptibility measurements have been made over a wide range of temperature for the alloy series CoAl1−xVx for 0≤x≤0.5. Neutron diffraction measurements have also been made at room temperature using the Rutherford Appleton Laboratory spallation source (ISIS). The observed intensities suggest that for x≤0.25 the structure is the singly ordered B2 (CsCl) structure with the V atoms occupying Al sites. Beyond this concentration a model in which double ordering of the L21 (Heusler) type with the V atoms favoring one of the two equivalent Al sites seems consistent with the results. The magnetization measurements indicate that the series becomes ferromagnetic for x〉∼0.1 with the intrinsic magnetization σ rising to a maximum of ∼50 emu. g−1 at x=0.5 for which the Curie temperature TC is ∼320 K. The inverse susceptibilities are generally linear with temperature and almost independent of concentration for x〉0.2, suggesting an itinerant interpretation. The maximum values of TC and σ reached are less than half those achieved in the corresponding CoAl1−xMnx system but comparable with those seen in the CoAl1−xCrx system. Comparisons with the isoelectronic CoGa system are drawn. The results have relevance to theoretical estimates of impurity moments in CoAl and CoGa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344634
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  • 9
    Electronic Resource
    Electronic Resource
    Anomalous low-frequency butterfly curves for subsidiary absorption and ferromagnetic resonance overlap at 3 GHz (abstract) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5642-5642 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Subsidiary-absorption butterfly curves of spin-wave-instability threshold versus static in-plane field have been obtained for yttrium-iron-garnet (YIG) thin films at 3 GHz. The butterfly curves have been found to be rather anomalous, typically displaying a pronounced dip and a very low minimum threshold. These anomalous features are attributed to the overlap of the subsidiary-absorption field region with ferromagnetic resonance (FMR). First-order instability theory was extended to include the uniform-mode response near FMR. The extended theory yields good fits to the data for reasonable values of the YIG FMR linewidths. The theoretical analysis also shows a predicted flip in the azimuthal propagation angle φk for the unstable spin waves in the region of FMR overlap. With increasing field, there are predicted discontinuous changes in φk from 90 ° to 0 ° and back to 90 ° in the region of FMR.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345912
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic phase transitions in Mn5−xTxSi3 alloys : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4152-4153 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of a series of the intermetallic compound Mn5−xTxSi3 with T=3d transition metal Ti, V, Cr, and Ni have been examined as a function of the magnetic field (0–12 T) and temperature (2–300 K). The alloys have the same hexagonal D88 crystal structure as Mn5Si3 with very little change in lattice spacing. The magnetization measurements show that the substitutional elements produce a variety of effects, dramatically altering the field and temperature dependence of the AF1/AF2 and AF2/paramagnetic transitions. It is assumed that since the Mn–Mn distances in the parent alloy are all near critical values for instability the substitution on to Mn sites interferes significantly in the Mn–Mn interactions. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365062
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