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This paper presents a double-ladders circuit model of transformer winding for use in frequency response analysis (FRA) to diagnose the windings deformation. This model considers the nonlinear behavior of frequency-dependent parameter and core loss. A lumped parameter circuit model includes the axial and radial ladder network which are regarding to the winding discs and the eddy current paths of magnetic...
Magnetic nanogranular CoFe-yttrium-doped zirconia (FeCo-YSZ) films have been deposited by radio frequency magnetron cosputtering. By simply adjusting the thickness of films, the imaginary permeability spectrum of FeCo-YSZ films changed from a resonance-type permeability spectra to a relaxation-type permeability spectra. Based on this phenomenon, Nanogranular CoFe-YSZ films with various thicknesses...
Phase shifter is an important constituent element of magnonic devices, especially for the operations of logic gates based on spin waves. The mechanisms and ways to control phase shift of propagating spin waves have been studied for a period of time by both experiments and theory. The most universal design of spin-wave phase shifter is to use an Ostered field produced by a highly localized dc current...
Electric field control of the ferromagnetic magnetization process has become increasingly important because its great potential applications for thememory device, magnetic logic, magneto-electric sensor and the integration of magnetic functionalities into electronic circuits [1,2]. Since the magneto crystalline anisotropy is originated from the spin-orbital coupling of the materials, modification...
Decreases in head-disk gap have led to great advances in the magnetic recording technology used for hard disk drives. Because the head-disk gap has reached a few nm or less, head-disk contact can occur. Therefore, lubricant replenishment for depleted areas due to the head contact is a crucial issue in designing head-disk interface (HDI); however, the replenishment mechanism for monolayer or submonolayer...
Permanent magnet linear synchronous motor (PMLSM) has been widely used in various kinds of industrial applications due to its outstanding servo performance. However, the detent force is one of the major problems of PMLSM which brings about force ripple and mechanical vibration. The end effect detent force is the inherent defect of linear motors because of the length difference between primary and...
Magnetic field induced martensitic transformation in Fe-Mn-Ga Heusler alloys has been discovered by W. Zhu et. al and T. Omori et. al respectively in 2009 [1, 2]. Thereafter, very few works concerned about this alloy, considering its great potential of giant shape memory strain, large exchange bias and magnetocaloric effect [3]. One obstacle is that the crystal structure transitions of this material...
In recent years, MnxGa alloys with tetragonal structure have attracted much attention because of the erratic fluctuation of rare earth supply and especially the tunable magnetic properties from fer-rimagnetic to ferromagnetic by varying Mn content. It is theoretically estimated that MnGa compound in L10 structure owes high anisotropy constant Ku of 26 Mergs/cm3 and magnetization Ms of 845 emu/cm3,...
Magnetic levitation is one of the solutions for high-precision positioning systems due to its non-contact characteristic. Magnetic bearings have the potential of replacing the air bearings that are used in the semiconductor industry in which the vacuum environment is increasingly required. For the traditional z-actuators in the multi-DOF fine stage, a continuous power loss is inevitable because the...
As compared to all types of ferrite, the Z-type hexaferrite ((Ba, Sr)3Co2Fe24O41) materials have been the dominant materials for novel multifunctional devices operated in high frequency because of their soft coercivity, strong planer anisotropy, high resonance frequency and magnetoelectric coupling properties observed at room temperature [1-5]. Due to the structural complexity, the preparation of...
Recently, a lot of research has been focusing on the surface mounted microwave gyromagnetic devices fabricated by low-temperature cofired ceramics (LTCC) technique [1-2]. LiZnTi-ferrite materials have been widely applied in microwave gyromagnetic devices, such as circulator, phase shifter in the electronically scanned phased array antennae, due to its low coercivity (Hc), appropriate saturation flux...
Chemical ordering has crucial influences on the magnetic and other properties of Heusler alloys [1, 2]. Recently, theoretical investigations predict that highly ordered Fe2CrAl with L21 structure exhibits a half-metallic property with spin polarization of 82%[1]. However, other calculations based on experimental lattice parameters show a non-half-metallic property[2]. Additionally, the theoretical...
The heat management bottleneck drives the search for alternative approaches for energy-efficient information technologies. Temporal and spatial magnetic spin textures are of great interest, since their dynamics can occur with minimal dissipation. Typical examples include spin waves (magnons), which are the fundamental quasi-particle excitations of magnetically ordered systems, and skyrmions, which...
In the eddy current brakes, the magnetic field can be produced by excitation winding systems or by permanent magnets. According to the difference of flux sources, the eddy current brakes could be divided into three types: the electric excitation eddy current brakes, the permanent magnet eddy current brakes and the hybrid excitation eddy current brakes [1]-[2]. The hybrid excitation eddy current brakes...
In recent years, magnetocaloric materials have drawn tremendous attention for their giant mageto-caloric effect (GMCE). GMCE-based magnetic refrigeration provides one of the most promising technologies to replace vapor-compression refrigeration [1, 2]. Among the novel magnetocaloric materials, MnFePAs has been regarded as an ideal MCE system. However, the toxicity of As limits the use of these materials...
Improving accuracy is one of the most important research topics in many advanced industrial applications, such as microscopy, biomedical science and semiconductor lithography. On the one hand, to improve the accuracy requires improvement on the system precision, on the other hand, it requires improvement on the system vibration isolation capability. At present, active vibration isolation system composed...
Large diameter single crystal garnet films are in urgent need for the burgeoning optical communication [1] as well as novel Spintronics applications [2]. Existing growth technologies not only produce environmental toxic waste from the use of Pb but also result in a large lattice mismatch leading to high defect density, high loss and small Faraday rotation angle (FRA). To address these needs, this...
Multiple rectifier technology is an effective method to reduce the harmonic current injected from converter to the grid [1], and phase-shifting reactor (PSR) is a kind of magnetic equipment which can be used to realize the function of phase-shifting[2]-[4]. In the multiphase rectifying system, the phase-shifting property of PSR plays an important role in harmonic suppression, meanwhile, as an inductive...
Rare earth-cobalt based magnetic materials have attracted considerable attention due to their large anisotropy eld (HA), high saturation magnetizations (Ms), and high Curie temperatures (TC). As the first generation of rare earth-transition metal (RE-TM) based permanent magnet, SmCo5 possesses extraordinary high anisotropy led over 240 kOe, and nanocrystalline SmCo5 magnet bears coercivity as high...
Nowadays, magnetic refrigeration based on magnetocaloric effect (MCE) has attracted much attention. So far, a great number of rare earth (R)-based compounds with first-order phase transition have been found to exhibit large MCE. However, the first-order phase transition often presents narrow magnetic entropy change (ΔSM) peak and is usually accompanied with remarkable thermal/ magnetic hystereses,...
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