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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of a new family of ternary rare-earth iron nitrides R2Fe17N3−δ (invited) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5584-5589 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of interstitial ternary nitrides R2Fe17N3−δ has been prepared via a gas-solid reaction for R=Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y. These nitrides have structures related to the Th2Zn17 or Th2Ni17 structures of the R2Fe17 parent compounds, but the unit cell volumes are 6%–7% greater, and the Curie temperatures are approximately 400 K higher. The Fe-Fe exchange interactions are increased by a factor of 2.8 by nitrogenation, whereas the R-Fe exchange interactions are little changed. All compounds exhibit easy-plane anisotropy at room temperature, except for Sm2Fe17N3−δ, which shows strong uniaxial anisotropy and may be used to make permanent magnets. The Er and Tm compounds exhibit spin reorientations below room temperature. The anisotropy due to the iron sublattices is easy plane (K1 = −1.3 MJ/m3 at 4.2 K for Y2Fe17N3), but it changes sign to easy axis with cobalt substitution (K1 ≈ 1.0 MJ/m3 at 4.2 K for Y2(Fe1−xCox)17N3−δ when x≥0.2).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347957
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  • 2
    Electronic Resource
    Electronic Resource
    Hall effect due to spin injection in Co/Al planar junctions (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6995-6997 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Hall effect due to spin injection was investigated by using an Al Hall bar attached to a Co/Al planar wire junction. There is observed a significant change in the Hall voltage due to the spin injection when the position of the Hall bar is placed 0.5 μm away from the Co/Al interface. The obtained results were analyzed by taking into account the contributions of the enhancement of the ordinary Hall effect due to a locally increased gradient of the electrochemical potential, and of the extraordinary Hall effect due to the induced nonequilibrium magnetization. The spin diffusion length in Al in the present study is about 1 μm, and the induced difference in chemical potential between up and down spins is about 2.6×10−8 eV. The experimentally evaluated enhancement factor of the ordinary Hall effect is about 1.5, which shows a relatively small contribution to the net Hall effect compared to the extraordinary Hall effect due to the induced nonequilibrium magnetization. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372909
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  • 3
    Electronic Resource
    Electronic Resource
    Novel magnetostrictive memory device (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6400-6402 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A stress-operated memory device consisting of an ellipsoidal magnetic particle array and an electrostrictive grid is proposed. In the device, the magnetic state of the particle can be controlled only by the magnetostriction effect. Each particle is located at the intersection of the grid and has an in-plane uniaxial anisotropy. A pair of electric contacts is connected to the end of each wire. In the writing process, the driving voltages are simultaneously applied to two pairs of the selected contacts. This allows to apply a local electric field whose direction and amplitude can be regulated by varying the voltage intensity and polarity. The exerting stress on the magnetic particle results in the linear magnetostriction and hence an additional anisotropy energy in the particle. The in-plane total energy minimum, corresponding to the magnetization direction, follows the local electric field. Consequently the magnetization of the single magnetic particle located at the intersection can therefore be selectively switched. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372719
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic properties of amorphous nanocolumns created by heavy ion irradiation of paramagnetic YCo2 thin films (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. 6661-6666 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent studies have demonstrated the possibility of inducing amorphous latent tracks in metallic materials by GeV heavy ion irradiation. In the present work, 0.880 GeV 238U beams have been used to induce ferromagnetic amorphous nanocolumns in nonmagnetic crystalline YCo2 films. The loss of crystallinity deduced by x-ray analysis is in good agreement with the one determined by magnetic measurements. The Co magnetic moment in the columns is approximately equal to 1 μB, as in bulk amorphous YCo2, but the ordering temperature (150 K) is strongly reduced with respect to the bulk. Magnetization measurements reveal the nanocolumns to be single domain. A perpendicular anisotropy is observed in samples irradiated at the smallest fluencies, which is interpreted to be due to shape anisotropy. A progressive decrease of the anisotropy with increasing fluence is observed and qualitatively described in terms of dipolar interactions between columns. At low temperature, the coercive field reaches 650 Oe. A simple nonuniform magnetization reversal process is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358161
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Effect of buffer layer on antiferromagnetic grain size and exchange-coupling field of Cr70Al30/Fe19Ni81 bilayers : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7213-7215 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: MgO/Cr70Al30/Fe19Ni81 and ZnO/Cr70Al30/Fe19Ni81 layered films with different buffer layer thicknesses were prepared on (100)Si substrates in order to investigate the relationship among the exchange-coupling field, the grain size, and the lattice constant of the antiferromagnetic layer. The exchange-coupling field was found to consist of the intragrain exchange coupling and the intergrain coupling fields. The former field is inversely proportional to the product of the lattice constant and the grain size. The latter field is constant and changes its sign in association with the increase of the buffer layer thickness. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367822
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  • 8
    Electronic Resource
    Electronic Resource
    Shape induced in-plane magnetic anisotropy reorientation in epitaxial hexagonal close packed cobalt dots (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5621-5623 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The in-plane magnetic easy-axis reorientation was investigated for the arrays of (10⋅0) hcp Co rectangular dots 0.2 μm in width with a variable length from 3 to 5 μm perpendicular to the c axis. In the system, the magnitude of the shape anisotropy contribution is determined by a lateral aspect ratio of the dot, while the magnetocrystalline anisotropy contribution is temperature dependent. The torque curves for the dot arrays exhibited a characteristic fourfold symmetry due to the easy-axis reorientation. The reorientation angle from the initial easy axis was found to be dependent on the value of in-plane demagnetization factors as well as the temperature variable first and second magnetocrystalline anisotropy constants. The experimental results are in good agreement with the calculated effective magnetic anisotropy. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373418
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Magnetoresistance and planar Hall effects in submicron exchange-coupled NiO/Fe19Ni81 wires (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 4026-4028 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization reversal processes of submicron NiO/Fe19Ni81 exchange-coupled Hall cross with a variable width in the range from 0.2 to 0.4 μm were studied by the magnetoresistivity and the planar Hall effect measurements. The magnetization reversal was found to take place via a coherent rotation in the Hall cross, suggesting that the size of the antiferromagnetic domain is regulated by the wire width. The magnitude of the exchange coupling field Hex varied in proportion to the inverse wire width. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123249
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