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  • 1
    Electronic Resource
    Electronic Resource
    Small-angle neutron scattering in spin reorientation transitions of (ErxNd1−x)2Fe14B hard pseudoternaries : 35TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS San Diego, California (USA) 29 Oct−1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5545-5547 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Critical small-angle neutron scattering has been performed on (ErxNd1−x)2Fe14B hard intermetallics around the spin reorientation transition (SRT) temperatures, TSR. The measured scattered intensities show squared Lorentzian type behavior (for k ≤ 12 × 10−3 A(ring)−1) and the magnetic correlation lengths show well defined anomalies at TSR, related to the scattering within the magnetic domain walls, which transform at the SRT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347945
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  • 2
    Electronic Resource
    Electronic Resource
    High-field magnetostriction of TbCu, DyCu, and HoCu (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4814-4815 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Preliminary results are presented on the anisotropic and volume magnetostriction in pulsed high magnetic fields (0–16.6 T) of the antiferromagnetic intermetallics TbCu, DyCu, and HoCu from room temperature to 5 K. The results clearly point out the relevance of these measurements in order to determine magnetic phase transitions induced by the magnetic field. The strain measured was surprisingly large, up to 10−3 for DyCu, which is the largest magnetostriction observed in an antiferromagnet. For TbCu below≈40 K, two distinct field-induced spin-reorientation transitions are exhibited at critical fields of HC1≈2 T and HC2≈8.5 T. This result casts doubt on the collinear nature of the magnetic structure of TbCu. From 50 to 5 K the DyCu results show two anomalies at critical fields HC1≈7.5 T and HC2≈11 T. In addition, these measurements show that at 11 K and below a small anomaly occurs at HC3≈2.5 T. HoCu exhibits a complex magnetostriction behavior, but it too presents definite anomalies at HC1≈2.5 T, HC2≈9 T, and HC3≈13 T. These results would point to a noncollinear magnetic structure for HoCu. All of the critical magnetic field values observed were practically temperature independent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344771
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetocrystalline anisotropy in some RENi5 intermetallics : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6054-6056 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the parallel M(parallel) and perpendicular M⊥ components of the magnetization to the applied magnetic field HA have been carried out for all directions in the (010) plane on single crystals of hexagonal NdNi5, TbNi5, and HoNi5. These measurements were performed using a steady magnetic field of 15 kOe, in the ferromagnetic phase down to 4 K. These kinds of experiments allow a detailed description of the magnetocrystalline anisotropy to be given. The polar dependencies of the M(parallel) and M⊥ isotherms have been explained using a microscopic single-ion crystal electric field (CEF) and a molecular-field approximation to describe the exchange interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353467
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  • 4
    Electronic Resource
    Electronic Resource
    High pulsed field magnetostriction in Ho2Fe17 single crystal : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6147-6149 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetostriction measurements were performed on Ho2Fe17 single crystals, using high pulsed magnetic fields up to 15 T and in the temperature range of 5–300 K. Volume deformations in the basal plane have been observed to be one order of magnitude greater than the volume longitudinal deformation along the c axis. The main contribution to the magnetostriction modes arises from the 3d–3d exchange interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352731
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of vanadium on the RE and Fe sublattice anisotropies in some REFe12−xVx(RE=Y,Er,Tb) tetragonal compounds (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 3753-3759 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The compounds REFe12−xVx(RE=Y,Er,Tb) having the tetragonal crystal structure of ThMn12 exist in the composition range 1.5≤x≤4. The dependence of the magnetic properties on the vanadium content were investigated in order to evidence and study any influence of vanadium on the magnetic anisotropy of both iron and RE sublattices and, as a consequence, on the magnetic phase diagram of these systems. The influence of vanadium was found to be remarkable on Tc, Ms, and Fe anisotropy, which decrease in all the compounds with increasing V content. However the largest effect was observed on the RE anisotropy and particularly in TbFeV, where the anisotropy of the Tb sublattice is turned from planar to axial by increasing the vanadium concentration, thus giving rise to strong effects on the macroscopic magnetic behavior and on the magnetic phase diagram of these systems. The large variation of the spin reorientation transition temperature Tsr, observed by varying V content on both ErFeV and TbFeV, can justify the spread in the literature data which could be attributed to small not considered stoichiometry differences with respect to the nominal composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349228
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  • 6
    Electronic Resource
    Electronic Resource
    Spin reorientation transition in some REFe10V2 intermetallics under hydrostatic pressure : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5905-5907 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The large effect of the applied hydrostatic pressure on the spin reorientation transition (SRT) temperature observed in Er2Fe14B has been associated with the modification of the intensity of the CEF interaction with pressure. We propose that mainly the second order CEF terms are sensitive to the pressure and also that the applied pressure influences only slightly the fourth and sixth order CEF terms and the intensity of the R-Fe exchange interaction. In the present article, we report a study of the thermal dependence of the ac magnetic susceptibility under hydrostatic pressure up to 10 kbar in intermetallic compounds of the series RFe10V2 (R=Nd, Dy, and Er). The results show no evidence of any change of the SRT temperature in the measured range of pressure, which constitutes a confirmation of the negligible influence that the external applied pressure has on high order CEF terms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353517
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  • 7
    Electronic Resource
    Electronic Resource
    Spontaneous and field induced spin reorientation transitions of DyFe11Ti single crystal : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5908-5910 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spontaneous and field induced spin reorientation transitions (SRT) have been studied in the DyFe11Ti compound, using different experimental techniques as: ac magnetic susceptibility, magnetization, and electric resistivity. From these measurements, the thermal dependence of the easy magnetization direction has been undoubtedly determined from 4.2 to 300 K, range in which two SRT take place (at ∼69 and 187 K). We have checked the continuous character of the SRT at 187 K. On the other hand, it has been established that the SRT at 69 K under an applied magnetic field (H≥2 kOe) becomes of first order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353518
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  • 8
    Electronic Resource
    Electronic Resource
    Competing anisotropies and magnetization processes in the pseudoternary (HoxEr1−x)Fe10V2 tetragonal system (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 366-369 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A study of temperature and composition dependence of the magnetic anisotropy in the tetragonal (HoxEr1−x)Fe10V2 polycrystalline compounds was made by means of the singular point detection technique. At 293 K the easy magnetization direction lies along the tetragonal c axis [001] in all the samples and the anisotropy field increases linearly with increasing Ho content. However, with decreasing temperature the competition among the anisotropy of the different magnetic sublattices gives rise to a spin reorientation transition axis to cone in Er containing samples. The TSR value increases with increasing Er content. A significant in-plane anisotropy was found in all the compounds. This planar anisotropy is larger in HoFe10V2, where it favors the [100] direction of the basal plane, while in ErFe10V2 the [110] is the preferred direction. The difference between the anisotropy field along [100] and [110] directions was found to decrease with increasing Er content. A first-order magnetization process of type 1 was observed below 120 K in all the compounds when the magnetic field is applied along the [100] direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350717
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  • 9
    Electronic Resource
    Electronic Resource
    Study of the influence of the magnetoelastic energy in driving the magnetic and structural transition in TbCu : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5989-5991 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: TbCu suffers a structural transformation at TN = 117 K, with the establishment of a collinear antiferromagnetic order. On the other hand, YCu is a Pauli paramagnet, which also transforms structurally at Ts = 150 K. In order to test the influence of the magnetoelastic energy as the driving mechanism of the transition in TbCu, we have performed neutron diffraction experiments on the compound Tb0.6Y0.4Cu. From the thermal evolution of the structural and magnetic peaks, we have observed that both, structural (Ts) and magnetic transitions (TN), occur at different temperatures. This separation in the transition temperatures constitutes a strong indication that magnetoelastic energy is not responsible for the transition in TbCu, in spite of the large magnetostriction observed at low temperatures at the metamagnetic field induced transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350070
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal expansion and magnetostriction in colossal magnetoresistance mixed valence manganites (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5504-5504 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural aspects are closely related to the large spontaneous and field-induced magnetic and magnetogalvanic effects in mixed valence manganites. Local distortions are the source of an extra contribution to the thermal expansion. These were associated with a charge localization process.1 The existence of ferromagnetic order in these compounds favors the carriers mobility and, as a consequence, produces unexpected magnetovolume effects.2 We report thermal expansion measurements within the temperature range 4–800 K and magnetostriction up to 15 T in the series (R1−yRy)1−xCaxMnO3 (R=La, Nd and R′=Y, Tb). We have found completely unusual volume magnetostriction at temperatures at which the system is in the insulator state (paramagnetic, antiferromagnetic, spin-glass states). These results give a deep insight into the mechanism responsible for the colossal magnetoresistance and reveal these experimental techniques as an excellent tool to follow the spontaneous and field-induced localization and delocalization processes. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364583
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