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  • American Institute of Physics (AIP)  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Relaxation dynamics of metastable antiferromagnetic states (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5430-5432 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using microwave ultrasonic interferometry we have studied the relaxation dynamics of an order-order transition in an Ising antiferromagnet. The system is prepared in one antiferromagnetic phase and relaxes to its thermodynamically inequivalent time-reversed conjugate, driven by an induced staggered field. The time-reversed phases induce equal and opposite changes in the velocity of transverse polarized ultrasonic waves and this is exploited by the interferometer to monitor the volume fractions of the conjugate phase during the relaxation process. The results indicate that the relaxation is dominated in the initial stages by domain growth of the stable phase as opposed to nucleation-dominated growth. This process can be closely fitted by a time-cubed growth law for the domains of stable phase. The final stages are well approximated by exponential behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344579
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic structures and interactions in Ho/Y, Ho/Lu, and Ho/Er superlattices (invited) : 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. 6274-6277 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ho/Y and Ho/Er superlattices have been grown by molecular-beam epitaxy using a Balzers UMS 630 instrument. The superlattices were grown on a sapphire substrate with an Nb buffer and Y seed layer. X-ray-diffraction techniques were used to characterize the crystallographic structure and neutron-diffraction techniques to determine the magnetic structures. The results for the Ho/Y systems were consistent with long-range order being formed coherently through the whole superlattice. The moments in the Ho layers were aligned in the basal plane and most of the structures could be described by helical structures with a turn angle between holmium planes of ΨH and between nonmagnetic Y planes ΨY. ΨY is found to be largely independent of temperature or superlattice, while ΨH decreases with decreasing temperatures and at low temperatures takes a commensurate value, so as to take advantage of the basal plane anisotropy. The results for the Ho/Er superlattices differ because the Er has a magnetic moment and the anisotropy favors alignment along the c axis. Between the ordering temperature of bulk Ho and bulk Er, the results are similar to those of the Ho/Y superlattices. The ordering propagates through the Er layers but the Er moments are not ordered. At lower temperatures the Er moments order in a cycloidal (a/c) structure with the basal plane components having fairly long-range coherence with the Ho moments, but the c-axis components having no coherence from one Er layer to the next.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358303
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  • 3
    Electronic Resource
    Electronic Resource
    High-sensitivity ultrasonic interferometer for the detection of magnetic phase transitions (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3193-3195 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An improved technique is described for the detection of magnetic phase transitions using acoustic waves with electrical interferometry. The method employs zinc oxide transducers sputtered directly onto the sample. These transducers operate efficiently at frequencies up to 3 GHz, corresponding to acoustic wavelengths of the order of 2 μm. By measuring the phase of high-order multiple echoes, changes in sample thickness and/or velocity of parts in 109 can be detected. The method has been used to determine the phase diagram of the metamagnet dysprosium aluminum garnet for magnetic fields parallel to [001]. General agreement with earlier determinations based on thermodynamic measurements is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338924
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  • 4
    Electronic Resource
    Electronic Resource
    Structure of niobium thin films on sapphire (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2195-2197 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structure of Nb thin films grown by molecular beam epitaxy on sapphire has been studied using high-resolution x-ray scattering techniques. Transverse scans of the x-ray wave vector transfer through the (110)Nb Bragg peak show diffuse scattering with a Lorentzian-squared profile, and satellite Bragg peaks for certain orientations of the crystal. The former feature arises from a random, two-dimensional network of Nb domains, and the latter from a periodic distortion of the Nb films at the terrace edges of the vicinal sapphire substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110551
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