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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of highly stable carbides (Er0.9Y0.2)2Fe17Cx (x=0–2.8) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5887-5889 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Carbides with nominal compositions of (Er0.8Y0.2)2Fe17Cx (x=0, 0.5, 1.0, 1.5, 2.0, 2.5, 2.8) were prepared by arc-melting and melt-spinning method. The arc-melted and heat-treated samples with x=0, 0.5, 1.0 are single-phase, hexagonal Th2Ni17 structure. When x=1.5, the Th2Ni17 structure transforms to the Th2Zn17 structure, while for x≥1.5, only optimal melt-spun samples crystallize in the Th2Zn17 structure. The carbides with x≥1.5 are stable and maintain their rhombohedral structure after being heat treated at 1000 °C. The carbides with x=2.8 have a 6.5% volume expansion and a 345-K Curie temperature enhancement over those of the carbon-free compound. The magnetic moment per iron atom μFe remains 1.96 μB throughout the entire series. The spin reorientation temperature TSR increases, when carbon enters interstitially, from 71 K when x=1.0 to about 122 K when x=2.8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353511
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  • 2
    Electronic Resource
    Electronic Resource
    Hard magnetic properties in melt-spun Co82−xFexZr18 alloys : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5932-5934 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Co82−xFexZr18 (0≤x≤16) alloys melt-spun with vs=40-47 m/s exhibit a single phase for all x. The Curie temperature Tc and the room-temperature saturation magnetization σs increase monotonically with increasing Fe concentration x. The anisotropy field for x=0 is found to be about 3.13T. In the as-quenched samples at the optimal quenching rate, room-temperature coercive field Hc decreases almost linearly from 3.0 kOe for x=0 to 1.3 kOe for x=16. The maximum energy product (BH)max increases at first with increasing Fe concentration x, and goes through a maximum value of 4.2 MGOe at about x=5, then decreases with x.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353525
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic properties of amorphous and crystalline (Fe1−xCox)62.5Si12.5B25 alloys : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5730-5732 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The saturation magnetization σs and Curie temperature Tc for amorphous (Fe1−xCox)62.5Si12.5B25 alloys are found to decrease monotonically with increasing Co concentration. The variation of crystallization temperature Tcr with x shows a linear increase. These results are different from those of amorphous Fe-Co-based alloys with composition near 20 at. % (Si+B). The crystalline samples with x≤0.3 produce a single phase with Cr5B3-type structure. When the Co concentration x is richer than 0.6, the unidentified phase appears, and its Curie temperature drops with x from 910 K for x=0.6 to 426 K for x=1.0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353606
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic properties of Sm- and Cu-doped oriented SmCo5 ribbons prepared by melt spinning (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 2787-2790 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Oriented melt-spun ribbons with composition Sm1+Y(Co1−XCux)5 (X=0–0.3 and Y=0–0.2) were fabricated with a wheel speed of 5 m/s, followed by annealing in the temperature range of 600–1000 °C for 30 min. Our results show that a high degree of texture, in which the c axis is parallel to the longitudinal direction of the ribbons, is obtained in all above ribbons. The room temperature intrinsic coercivity can be significantly enhanced by both Sm additions and Cu substitution and coercivities of 21 and 12.4 kOe an achieved in Sm1.15Co5 and Sm(Co0.8Cu0.2)5 ribbons, respectively. Compared with the Sm-doped ribbons, Cu-doped ribbons exhibit a better thermal stability of coercivity and a high intrinsic coercivity of 5.2 kOe can be maintained at 300 °C in Sm(Co0.8Cu0.2)5 ribbons. Further analysis indicates that the coercivities of Sm- and Cu-doped ribbons are determined by different demagnetization mechanisms. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1286245
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  • 5
    Electronic Resource
    Electronic Resource
    Structure, exchange interactions and magnetic anisotropy of Ho2Co17−xSix compounds (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 427-431 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural and magnetic characteristics of Ho2Co17−xSix (x=0, 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0) compounds have been investigated by means of x-ray diffraction and magnetic measurements. Powder x-ray diffractograms show that all samples are single phase and have the hexagonal Th2Ni17-type or the rhombohedral Th2Zn17-type structure. The substitution of Si for Co leads to a monotonous decrease in unit cell volume v and Curie temperature TC. The compensation points are observed for the samples with x=2.5 and 3.0, and the compensation temperatures shift to higher temperatures with increasing Si content. The intersublattice-molecular-field coefficient, nHo–Co, has been determined on the basis of magnetization curves at the compensation temperature. It has been found that the Si substitution for Co has little influence on Ho–Co exchange interaction. The magnetic phase diagram has been determined from the temperature dependence of magnetization and the XRD patterns of magnetically oriented powder samples. The spin-reorientation temperatures of Ho2Co17−xSix compounds are found to decrease with Si content for x〈2.5 and then increase for x〉2.5, attaining a minimum value of 237 K at x=2.5. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371879
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  • 6
    Electronic Resource
    Electronic Resource
    Honeycomb domain structures in amorphous TbFe thin films (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 3124-3126 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties and domain structure of amorphous TbFe thin films were studied by magnetic measurement and magnetic force microscope. Honeycomb domain structures were found in the as-deposited amorphous film. The domain structures were composed of many small white round dots embedded in the black matrix, which formed an irregular hexagonal pattern with some deformation. The average dot size was about 450 nm, with an average separation of 610 nm. The derived domain wall energy density γ and the exchange constant A were 0.95×10−2 and 1.79×10−11 J/m, respectively. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1391423
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  • 7
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of SmxCo5/α-Fe (x=0.65–1.3) prepared by mechanical milling and subsequent annealing (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 2857-2860 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Powder mixtures of SmxCo5 (x=0.65–1.3)+20 wt % α-Fe were mechanically milled. Annealing these as-milled powders results in the formation of a mixture of the hard phase Sm–(Co, Fe) and the soft phase Fe–Co. For the as-milled Sm1Co5+20 wt % α-Fe powder, the hard phase changes with the increase of annealing temperatures. The optimal maximum energy product (BH)max is obtained in the powder annealed at 550 °C for 30 min. Depending on the Sm content in the as-milled SmxCo5 (x=0.65–1.3)+20 wt % α-Fe powders, the hard phases can be 1:7, 1:5, or 2:7 phase after a heat treatment at 550 °C for 30 min. The coercivity of 6.5 kOe and maximum energy product of 17.8 MGOe is achieved for the powder with x=1.0. The highest coercivity of 9.67 kOe is achieved for the powder with x=1.2. From the measurements of the coercivity obtained from minor hysteresis loops, it is concluded that the coercivities of this type of magnets are controlled mainly by the domain wall pinning. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1344219
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of the relative proportion of ferromagnetic and charge-ordered phases on the metal–insulator transition temperature in La0.5Ca0.5Mn1−xGexO3 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 7041-7044 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and transport properties of rare-earth manganites La0.5Ca0.5Mn1−xGexO3 with 0≤x≤0.1 have been investigated systematically. Doping Ge at Mn sites increases the metal–insulator transition temperature (TP) from 124 to 210 K with increasing x from 0 to 0.08. The introduction of Ge severely destroys the charge-ordered state and hardly affects the ferromagnetic ordering. For low-doped samples, TP is also increased dramatically by the magnetic field, especially in the field-cooled mode. Magnetic analysis suggests the coexistence of the charge-ordered antiferromagnetic phase and the ferromagnetic phase. We propose that the proportion of the ferromagnetic phase and the charge-ordered phase can affect TP in phase-separated compounds. The phase diagram of La0.5Ca0.5Mn1−xGexO3 with 0≤x≤0.1 is presented. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1327600
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  • 9
    Electronic Resource
    Electronic Resource
    Lattice effects of doping the Mn sites in La0.5Ca0.5MnO3 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 5924-5927 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structure, magnetic, and transport properties of La0.5Ca0.5Mn1−xMxO3 (0≤x≤0.1) with M=Ge and Sn have been investigated systematically. A significant lattice expansion is observed in the Sn-doped samples, but not in the Ge-doped ones. At the same time, a substitution of Mn by Ge has little effect on Curie temperature (TC), but increases the metal-insulator transition temperature (TP). In contrast, the TC decreases sharply for Sn doping, while the TP shows an increase for x〈0.02 and a decrease for x〉0.02. Compared with Ge doping, Sn doping is more effective in destroying the charge-ordered state. The difference in local lattice distortions due to the Ge and Sn doping is believed to be responsible for the present observations. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1314873
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  • 10
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of Y2Co17−xMnx (x=0–8) compounds (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5311-5313 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray diffraction (XRD) and magnetization measurements were employed to investigate the effect of Mn substitution for Co on the structure and magnetic properties of Y2Co17−xMnx compounds with x=0–8. XRD patterns show that all samples are single phase with a hexagonal Th2Ni17-type structure. The substitution of Mn for Co in Y2Co17−xMnx compounds leads to a monotonic increase in unit cell volume. The saturation magnetization remains nearly constant for x≤3, then decreases quickly with increasing Mn content; this can be explained by the change of the 3d energy band structure and an electron transfer process. The Curie temperature TC is found to decrease rapidly with increasing Mn concentrations. X-ray diffraction measurement on magnetically aligned Y2Co17−xMnx compounds exhibit an easy-plane type of magnetic anisotropy at room temperature for x=0 and an easy-axis type of magnetic anisotropy at room temperature with x=1–7. Substitution of Mn for Co leads to a change of the magnetocrystalline anisotropy of the Co sublattice from the basal plane to the c axis and strongly increases the uniaxial anisotropy of Y2Co17−xMnx. The magnetocrystalline anisotropy field HA is found first to increase and then decrease with increasing Mn concentration, attaining a maximum value of 20.6 kOe at x=3. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373331
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