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  • 1
    Electronic Resource
    Electronic Resource
    Experimental evidence of resputtering of the yttria layer in a YBa2Cu3O7−x/Y2O3/YBa2Cu3O7−x trilayer film (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 2380-2386 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using transmission electron microscopy and energy dispersive x-ray spectroscopy analysis, the microstructure and composition of a YBa2Cu3O7−x/Y2O3/YBa2Cu3O7−x trilayer film deposited on MgO by off-axis sputtering at 670 °C and 100 mTorr was investigated. The YBa2Cu3O7−x layer in contact with the substrate was found to be mainly single phase. However, the top YBa2Cu3O7−x layer was embedded with 5–10 nm crystalline Y2O3 (yttria) particles, which disturbed the local microstructure. The top YBa2Cu3O7−x layer also had barium copper oxide particles covering its surface. The partial decomposition of the top YBa2Cu3O7−x layer may have been due to resputtering of the yttria layer which locally altered the deposition conditions. In particular, the oxygen pressure in the vicinity of the growing film may have increased due to sputtering of the yttria layer by plasma gas atoms and the sputtered target atoms. As a result, deposition occurred under conditions away from the thermodynamic stability line.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357585
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of surface layers on ferromagnetic resonance in thin Fe films: Ni, Co, Si, and YBa2Cu3O7−δ : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5595-5597 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of ferromagnetic resonance experiments on 10 nm polycrystalline films of Fe with very thin surface layers of Ni and Co, using Si and a high temperature superconductor (YBCO) as substrates is reported herein. An earlier fmr investigation of Fe films on YBCO showed strongly temperature dependent linewidths and resonance fields but only small effects in Fe on Si. In this work, the resonance of Fe on Si is found to be significantly narrower when the Fe film has thin (0.5 to 1.0 nm) Ni surface layers, compared to uncoated Fe; linewidths are as narrow as 15 Oe at 9 GHz. However, when YBCO substrates are used, the iron resonance properties are nearly the same as in the case where no Ni was used. This indicates that the effects seen in earlier work were not the result of an oxide layer on the Fe but may indicate a magnetically active surface layer in the YBCO. Co surface layers have the effect of producing strongly temperature dependent anisotropies and linewidths on all substrates used, with the strongest temperature dependence near 160 K, possibly caused by the ordering of an antiferromagnetic surface layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355652
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  • 3
    Electronic Resource
    Electronic Resource
    YBa2Cu3O7−y/Y2BaCuO5 composites: Growth and characterization (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 446-450 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have prepared thin film composites of Y1Ba2Cu3O7−y ("123'') and Y2Ba1Cu1O5 ("211'') by off-axis sputtering from separate targets of the 123 and 211 material. X-ray diffraction on the films shows the presence of c-axis oriented 123, and (00L) ordered Y2O3, but no indication of 211 lines. The c-axis lattice constant does not show any change compared to our pure 123 films. As the volume percentage of 211 material increases, we see a reduction in Tc and Jc, and an increase in the resistivity. The temperature and field dependence of the critical current are different for our composites compared to our pure 123 films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355278
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetization-related transport anomalies in metal/ferromagnetic insulator heterostructures : 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. 6437-6439 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetoresistance measurements have been performed on epitaxial metal/ferromagnetic insulator bilayers. They are more sensitive to magnetic behavior at the interface of such structures than magnetization measurements. It is clear from the magnetoresistance data that previously reported slope discontinuities in the resistance versus temperature of such heterostructures are magnetic in origin. These studies demonstrate that the conduction electrons of the metal are coupled to the spins in the magnetic insulator, and act as probes of the magnetic state at the interface between the two materials. An example of the usefulness of this probe is shown by magnetoresistance measurements on a Ag/EuO bilayer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358241
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  • 5
    Electronic Resource
    Electronic Resource
    Thin-film composite mixtures of YBa2Cu3O7−δ and Y2O3 (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 252-256 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin-film, composite mixtures of YBa2Cu3O7−δ (YBCO) and Y2O3 (yttria) have been grown by off-axis sputtering onto (100) SrTiO3 and (100) and (110) MgO. X-ray-diffraction measurements for films grown on (100) substrates show the presence of c-axis-oriented YBCO and (h00)-ordered yttria. The composites deposited on (110) MgO are insulating, and x-ray analysis shows the presence of Y2Ba1Cu1O5 along with c-axis YBCO. Scanning electron microscopy analysis shows the films to be very granular. The superconducting transition temperature and resistivity ratios between 300 and 100 K of the composites grown on the (100) substrates have been measured. A dramatic change is seen in these transport properties around 70% (volume) of YBa2Cu3O7−δ, which may be explained by the phase diagram for Y-Ba-Cu-O. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359385
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  • 6
    Electronic Resource
    Electronic Resource
    Resistivity anomaly in nonmagnetic metals with ferromagnetic insulator proximity layers : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6679-6681 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial bilayers and multilayers were prepared using the ferromagnetic insulator EuO and the metals V and Ag. For metal films of thickness 10 nm or less, there is a sharp change in the slope of the resistivity versus temperature, which occurs at 86 K for EuO/V specimens and at 50 K for EuO/Ag specimens. Soft x-ray magnetic circular dichroism measurements showed a clear dichroism for Eu but none for V. Therefore, the dR/dT discontinuity is attributed to a change in spin-dependent surface scattering at the insulator/metal interface caused by the magnetization of the surface layer of Eu++ ions. The difference in temperature between the dR/dT discontinuities between the two metals (and from the bulk EuO Curie temperature of 70 K) is tentatively attributed to the influence of the Ruderman–Kittel–Kasuya–Yosida (RKKY) mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356893
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of transport and magnetic properties in thin film La0.67(CaxSr1−x)0.33MnO3 mixtures (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6563-6566 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have grown thin films of (100)-oriented La0.67(CaxSr1−x)0.33MnO3 on (100) NdGaO3 substrates by off-axis sputtering. We have looked at the changes in the resistivity and magnetoresistance of the samples as the Ca/Sr ratio was varied. We find that as the calcium fraction is decreased, the lattice match to the substrate decreases, and the films become more disordered, as observed in transport measurements and the variation in Curie and peak resistance temperatures. We find a correlation between the temperature independent and T2 terms to the low temperature resistivity. The room temperature magnetoresistance exhibits a maximum as the peak temperature is increased by the substitution of Sr for Ca, and a change in the field dependence to the resistivity at room temperature is observed.© 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370162
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  • 8
    Electronic Resource
    Electronic Resource
    X-ray photoemission characterization of La0.67(CaxSr1−x)0.33MnO3 films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5414-5416 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Curie temperature and x-ray photoemission spectra of thin films of La0.67(CaxSr1−x)0.33MnO3 have been studied as a function of the Ca/Sr ratio. The films were grown by off-axis cosputtering from individual targets of La0.67Ca0.33MnO3 (LCMO) and La0.67Sr0.33MnO3 (LSMO) onto (100) oriented NdGaO3 substrates. The films grow with a (100) orientation, with no other orientations observed by x-ray diffraction. For the alloy mixtures, the Curie temperature, TC, varies slowly as the Ca/Sr is decreased, remaining (approximate)300 K, while for the LCMO and LSMO films TC is 260 and 330 K, respectively. The Mn-O valence structure is composed of two dominant peaks, whose positions undergo a change as the Ca fraction is decreased. The core lines behave as linear combinations of lines from pure LCMO and LSMO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369995
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  • 9
    Electronic Resource
    Electronic Resource
    Advances in the development of the magnetoquenched superconducting valve: Integrated control lines and a Nb-based device (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 1371-1377 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetoquenched superconducting valve is a nonvolatile switch consisting of a ferromagnetic film that spans a superconducting strip. A device state is dictated by the magnetization orientation of the ferromagnetic element and the corresponding magnetic fringe fields at its edge which control the critical current in the underlying superconductor. A Pb-based device has been fabricated with a "write wire" inductively coupled to the ferromagnetic layer as an integrated control line. A current pulse through the control line produces a small local magnetic field that is larger than the coercivity Hc of the ferromagnet and which orients the magnetization, thus switching the device state. A comparison of device switching is made between use of a current pulse through the control line and use of an external magnetic field pulse. There is good agreement between the two methods, and device switching is demonstrated with fields as small as 20 Oe. In a further effort to develop a practical device, the quenchvalve effect is demonstrated in Nb, the superconducting digital electronics "industry-standard" material. A two-fold modulation in the critical current is observed at T=4.2 K, and the effect increases as the temperature approaches Tc=9 K. These results further demonstrate the promise of this device for application as a storage cell in a high-density superconducting random access memory. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1427428
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  • 10
    Electronic Resource
    Electronic Resource
    Highly spin-polarized chromium dioxide thin films prepared by chemical vapor deposition from chromyl chloride (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 3789-3791 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Highly spin-polarized chromium dioxide (CrO2) thin films were deposited on (100) TiO2 substrates by chemical vapor deposition using chromyl chloride as a precursor. The spin polarization, as measured by the point contact Andreev reflection technique, was 81±3%. X-ray diffraction θ/2θ scans indicated the films grew completely (100) oriented, in registry with the (100) oriented TiO2 substrate. X-ray diffraction φ scans on the CrO2 (110) reflection indicated the expected twofold symmetry, with no evidence of misaligned material. The resistivity at room temperature was 240 μΩ cm and decreased to 10 μΩ cm at 5 K, consistent with metallic behavior. The films were ferromagnetic with a Curie temperature of 395 K and a coercivity of ∼100 Oe at 298 K. The use of chromyl chloride as a precursor resulted in efficient and controlled CrO2 film growth. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126782
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