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  • 1
    Electronic Resource
    Electronic Resource
    Propagation of the magnetic domain wall in submicron magnetic wire investigated by using giant magnetoresistance effect (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6181-6183 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetization reversal phenomenon in a submicron magnetic wire with a trilayer structure consisting of NiFe(400 Å)/Cu(200 Å)/NiFe(50 Å) was investigated by measuring the electric resistance in external magnetic fields. It is shown that the magnetization reversal can be very sensitively investigated by utilizing the giant magnetoresistance effect. The time variation of resistance during the magnetization reversal was also measured and the velocity of the magnetic domain wall propagating in the wire was determined at 77 K. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370214
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  • 2
    Electronic Resource
    Electronic Resource
    High-resolution observation of magnetization processes in 2 μm × 2 μm × 0.04 μm permalloy particles : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5075-5077 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetization process in an array of 2 μm × 2 μm × 0.04 μm permalloy particles fabricated on a 100 nm carbon membrane was investigated by means of high-resolution Lorentz microscopy and electron holography in magnetic fields parallel and perpendicular to the film surface. For perpendicular fields, the magnetization reversal was found to begin with the nucleation of a vortex which gradually transformed into a closure domain configuration. At the remanent state, the flux closure was achieved with the generation of a new type of doubled domain wall. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361921
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetostriction and thermal expansion measurements on FeRh1−xPtx alloys : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4659-4661 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report high-field magnetostriction and thermal expansion measurements in FeRh1−xPtx (x=0.75, 0.765, and 0.7) compounds. From the thermal expansion measurements we have observed the para-ferromagnetic and ferro-antiferromagnetic transitions for x=0.75 and 0.765, and the para-antiferromagnetic transition in the 0.7 compound. The volume expansion associated with the first-order transitions has been determined. The results of the magnetostriction measurements are complex and are explained here on the basis of an induced transition from an antiferromagnetic to a ferromagnetic state, induced by the applied magnetic field. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361696
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamical properties of magneto-optical effect in magnetic fluid thin films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5846-5848 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dynamical properties of the magneto-optical effects of magnetic fluids thin films were investigated. The thin films, 12 μm thick, of magnetite colloidal particles in water solvents and alkylnaphthalene one were prepared. A pulsed magnetic field H(t) was generated in a single turn coil by discharging a 40-kV capacitor bank. The intensity I(t) of the transmitted light through the two crossed polarizers and the films located in the coil was measured. The relaxation process of the magneto-optical effect can be described in terms of a single relaxation time, τ=3 μs, for a water-based magnetic fluid, while the relaxation time constant for alkylnaphthalene one depends on the field strength. These dynamical properties can be interpreted by the time-dependent Ginzburg–Landau theory by introducing the order parameter of the colloidal particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342231
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of magnetic field cooling and magnetization anomaly in magnetic fluids near melting point (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4267-4269 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetization process of ferrofluids with carrier fluids of water, paraffin, and alkylnaphtalene was investigated in a temperature range from 77 to 300 K as functions of the freezing rate and the intensity of cooling magnetic fields. A uniaxial magnetic anisotropy is induced by field cooling in frozen ferrofluids. This induced anisotropy which is caused by the formation of clustering of magnetic particles disappears on heating near the melting point. The magnetization of the frozen fluids exhibits an anomalous increase below the melting point of the carrier fluids. In a frozen state, no relative motion of particles, such as Brownian motion, occurs. With increasing temperature, the inhibited motion will be released gradually by the recovery of viscosity. The anomaly may be related to glassy transition and premelting. These magnetic properties are discussed in terms of mesoscopic phase transition between liquid and solid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340199
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  • 6
    Electronic Resource
    Electronic Resource
    Demagnetization process of sintered R17Fe83−xBx magnets (R=Nd or Pr) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3316-3318 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of R-Fe-B (R=Nd or Pr) sintered magnets rich in B relative to R15Fe77B8 were synthesized to investigate the demagnetization processes for various configurations of R2Fe14B grains. The R2Fe14B grains in these magnets are well separated from each other by a surrounding B-rich R1.11Fe4B4 phase. The coercivity of Nd17Fe83−xBx at 320 K is increased from 11 to 18 kOe with an increase of B content from 17 to 37 at. %. With a decrease of temperature from 320 K, the coercivities of Nd-Fe-B magnets for x=17, 30, and 37 at. % exhibit a monotonic increase. However, below 50 K, the coercivity of the magnet with x=37 at. % decreases sharply to 5 kOe. This behavior is interpreted in terms of the ferromagnetic ordering of the Nd1.11Fe4B4 phase at about 20 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340822
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic anisotropy induced by magnetic field cooling in Ni3Mn alloys (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3614-3616 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic anisotropy of Ni3Mn alloys with various degrees of atomic order has been investigated by a torque magnetometry. By cooling down from 300 to 80 K in a magnetic field of 10 kOe, a unidirectional anisotropy Kd with a period of 360° was induced. The temperature dependence of this anisotropy can be expressed by exp(Q/T) from 50 to 20 K and by log(T) below 20 K. The magnitude of Kd was increased by a factor of 100 during cooling down from 50 to 4.2 K. Furthermore, the hysteresis loop at 4.2 K for a disordered alloy was shifted such that the easy direction of magnetization is that of the cooling magnetic field. They are discussed in terms of exchange anisotropy and the size distribution of clusters with antiferromagnetic coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340712
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  • 8
    Electronic Resource
    Electronic Resource
    Polarized neutron scattering of D2O-based magnetic fluids (depolarization) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5849-5851 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetite colloidal fluid with a carrier fluid of deuterium oxide (D2O) was prepared to eliminate the incoherent scattering by hydrogen nucleons and the depolarization of cold neutrons was measured. The magnetic fluid was cooled down to 17 K in an external magnetic field of 10 kOe. The sample exhibited a finite residual magnetization Mr, which decreases with increasing temperature from 17 K. With elevating the temperature from 17 to 300 K, the depolarization was measured in three cases in which the directions of the beam, Mr, and polarization are mutually changed. The polarized neutrons transmitting through the sample were depolarized by the magnetic moments in the colloidal particles. The polarizations as a function of the product of Mr and neutron wavelength λ at different temperatures reduce to the same functional form. The model which shows that no interactions exist among the ferrous colloidal particles succeeds partly in explaining the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342232
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetization reversal in submicron magnetic wire studied by using giant magnetoresistance effect (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 1116-1117 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetization reversal phenomenon in a submicron magnetic wire with a trilayer structure consisting of NiFe(200 Å)/Cu(100 Å)/NiFe(50 Å) was investigated by measuring the electric resistance in an external magnetic field. A giant magnetoresistance (GMR) effect of about 0.8% was observed when the magnetizations in two NiFe layers are oriented antiparallel. It is demonstrated that magnetization reversal phenomena can be very sensitively investigated by utilizing the GMR effect. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120941
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  • 10
    Electronic Resource
    Electronic Resource
    Aharonov-Bohm oscillation of resistance observed in a ferromagnetic Fe-Ni nanoring (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 316-318 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetoresistance of a ferromagnetic Fe–Ni nanoring with 420 nm in inner diameter and 500 nm in outer diameter was measured at very low temperatures below 100 mK. When a magnetic field is applied to the ring, the magnetoresistance exhibits oscillations whose period varies according to the field direction. This demonstrates the Aharonov–Bohm effect of the conduction electrons in the ferromagnetic nanoring. The amplitude of the oscillations can be regarded from the viewpoint of competition between the system size and the phase coherence length of the conduction electrons. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1492303
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