Calculation of the magnetic stray field of a uniaxial magnetic domain
Journal of Applied Physics 97:7 (2005)
Abstract:
We present an analytic solution for the magnetic field of a bar-shaped permanent magnet. Assuming a constant magnetization, we derive expressions for the stray field in three dimensions. The analytic solutions can be readily applied to field calculation problems for magnetic force microscopy simulations without the need for finite element methods. © 2005 American Institute of Physics.Extending the magnetic order of MnAs films on GaAs to higher temperatures
Journal of Magnetism and Magnetic Materials 288 (2005) 173-177
Abstract:
Manganese arsenide is a promising candidate for new spintronics applications since it is ferromagnetic at room temperature and can be grown with high epitaxial quality on semiconductors. However, the transition temperature of ∼40 °C is a limiting factor for device applications. Since the coupled magnetic and structural transition is of first order, it is in principle possible to shift the transition temperature by changing external parameters. Here we show that by either applying an external magnetic field or by growing the MnAs films on GaAs(1 1 1), i.e., by changing the epitaxial constraints which are equivalent to external pressure, ferromagnetic order can be stabilized well above the bulk-phase transition temperature. © 2004 Elsevier B.V. All rights reserved.Epitaxial MnAs films studied by ferromagnetic and spin wave resonance
Local-Moment Ferromagnets 678 (2005) 97-109
Magnetic coupling and exchange stiffness in striped MnAs films
Europhysics Letters 68:5 (2004) 726-732
Abstract:
We provide the first direct evidence of interactions in a self-organized pattern of coexisting ferromagnetic and paramagnetic MnAs stripe domains as a function of the coupling strength between the stripes (inter) and within one stripe (intra). The value of the intra exchange constant A = 17.7 × 1010 erg/cm is determined unambiguously from spin wave resonance. Additionally, in-plane ferromagnetic resonance measurements reveal the presence of a strong coupling between the neighboring stripes, which can dominate the weak intra-stripe interaction.Calculation and experimental verification of the acoustic stress at GHZ frequencies in SAW resonators.
IEEE Trans Ultrason Ferroelectr Freq Control 51:11 (2004) 1437-1448