APL: Magnetism and Superconductivity http://scitation.aip.org/ APL: Magnetism and Superconductivity Magnetoresistance in magnetic tunnel junctions with an organic barrier and an MgO spin filter http://link.aip.org/link/?APL/95/202506/1&agg=rss Greg Szulczewski, Huseyin Tokuc, Kaan Oguz, and J. M. D. Coey<br/> Exchange-biased magnetic tunnel junctions with a CoFeB/MgO pinned layer, a Co free layer and an aluminum tris-(8-hydroxyquinoline) spacer layer of thickness ranging from 08 nm have been prepared by photolithography. The devices show a room-temperature, zero-bias magnetoresistance of 12.50.3%, which ... [Appl. Phys. Lett. 95, 202506 (2009)] published Fri Nov 20, 2009. Four discrete Hall resistance states in single-layer Fe film for quaternary memory devices http://link.aip.org/link/?APL/95/202505/1&agg=rss Taehee Yoo, S. Khym, Sun-young Yea, Sunjae Chung, Sanghoon Lee et al.<br/> We report the realization of four distinct magnetic states using single layers of Fe at room temperature. When the Fe film was grown on the vicinal surface of GaAs, the fourfold-symmetric magnetization along crystallographic direction give rise to four distinct Hall resistance values due to the diff ... [Appl. Phys. Lett. 95, 202505 (2009)] published Thu Nov 19, 2009. Josephson effects in weakly coupled MgB intergrain nanobridges prepared by focused ion beam http://link.aip.org/link/?APL/95/202504/1&agg=rss Soon-Gul Lee, Sung-Hak Hong, Won Kyung Seong, and Won Nam Kang<br/> We have fabricated weakly coupled intergrain nanobridges from MgB films by a focused ion beam (FIB) patterning technique and studied their transition properties. The bridges were nominally 300 nm wide and 100 nm long, and crossed a single grain boundary perpendicularly. The temperature-dependent res ... [Appl. Phys. Lett. 95, 202504 (2009)] published Wed Nov 18, 2009. Element-specific magnetometry of EuS nanocrystals http://link.aip.org/link/?APL/95/202501/1&agg=rss Rachel S. Selinsky, David J. Keavney, Matthew J. Bierman, and Song Jin<br/> A soft x-ray absorption and x-ray magnetic circular dichroism (XMCD) study of the ferromagnetism in solution-grown EuS nanocrystals (NCs) is reported. The absorption edges of Eu M and M, S K, O K, and P K were probed to determine elementally specific contributions to the magnetism of EuS NCs. Differ ... [Appl. Phys. Lett. 95, 202501 (2009)] published Mon Nov 16, 2009. Spin-polarized tunneling in fully epitaxial magnetic tunnel diodes with a narrow-gap InMnAs electrode http://link.aip.org/link/?APL/95/192508/1&agg=rss H. Saito, S. Yuasa, and K. Ando<br/> We investigated spin-dependent tunneling properties in fully epitaxial Fe/ZnSe/InMnAs with a metal/insulator/semiconductor structure. A tunneling magnetoresistance (TMR) ratio up to 14% was observed, which is the first TMR reported in tunnel junctions with a narrow-gap magnetic semiconductor electro ... [Appl. Phys. Lett. 95, 192508 (2009)] published Fri Nov 13, 2009. Magnetic anisotropy tuned by interfacial engineering http://link.aip.org/link/?APL/95/192506/1&agg=rss N. Lei, D. H. Wei, C. S. Tian, S. H. Xiao, D. Z. Hou et al.<br/> With continuous variable composition, an artificial pseudomorphic template of 1 ML CuAu was achieved by epitaxial growth on Cu(001), in which the magnetic anisotropy and the spin reorientation transition of Ni films were investigated in situ. The result clearly indicates that the strain induced prot ... [Appl. Phys. Lett. 95, 192506 (2009)] published Fri Nov 13, 2009. Strong ferromagnetic Josephson devices with optimized magnetism http://link.aip.org/link/?APL/95/192509/1&agg=rss J. W. A. Robinson, Z. H. Barber, and M. G. Blamire<br/> We show that by interfacing Co with Rh in Nb-based superconductor-ferromagnetic-superconductor (SFS) Josephson devices, the bulk magnetization of the Co barrier is completely preserved, thus eliminating the issue of a magnetic dead layer present in other SFS devices. Electrical measurements demonstr ... [Appl. Phys. Lett. 95, 192509 (2009)] published Fri Nov 13, 2009. Agility of vortex-based nanocontact spin torque oscillators http://link.aip.org/link/?APL/95/192507/1&agg=rss M. Manfrini, T. Devolder, Joo-Von Kim, P. Crozat, N. Zerounian et al.<br/> We study the agility of current-tunable oscillators based on a magnetic vortex orbiting around a point contact in spin valves. The theory predicts that frequency tuning by currents occurs at constant orbital radius so an exceptional agility is anticipated. To test this, we have inserted an oscillato ... [Appl. Phys. Lett. 95, 192507 (2009)] published Fri Nov 13, 2009. Simultaneous determination of intergranular interactions and intrinsic switching field distributions in magnetic materials http://link.aip.org/link/?APL/95/192504/1&agg=rss O. Hovorka, Y. Liu, K. A. Dahmen, and A. Berger<br/> We develop a generally applicable method for the accurate measurement of intrinsic switching field distributions and the determination of exchange and dipolar interactions in granular magnetic materials. The method is based on the simultaneous analysis of hysteresis loop and recoil curve data. Its v ... [Appl. Phys. Lett. 95, 192504 (2009)] published Thu Nov 12, 2009. Memory effect of MnGe nanomagnets embedded inside a Mn-diluted Ge matrix http://link.aip.org/link/?APL/95/192505/1&agg=rss Shengqiang Zhou<!--orlang--> (&#x5468;&#x751F;&#x5F3A;)<!--orlang-->, Artem Shalimov, Kay Potzger, Nicole M. Jeutter, Carsten Baehtz et al.<br/> Crystalline MnGe nanomagnets are formed inside a Mn-diluted Ge matrix using Mn ion implantation. A temperature-dependent memory effect and slow magnetic relaxation are observed below the superparamagnetic blocking temperature of MnGe. Our findings corroborate that the observed spin-glass-like featur ... [Appl. Phys. Lett. 95, 192505 (2009)] published Thu Nov 12, 2009. Magneto-optical detection of single flux quantum signals in superconducting quantum interference device http://link.aip.org/link/?APL/95/192503/1&agg=rss Hironaru Murakami, Ryohei Kitamura, Iwao Kawayama, and Masayoshi Tonouchi<br/> The properties of an YBaCuO superconducting quantum interference device (SQUID) have been evaluated magneto-optically and electrically. It was found that the operating characteristics of the SQUID observed by means of the magneto-optical (MO) method show a good consistency with those measured by the ... [Appl. Phys. Lett. 95, 192503 (2009)] published Wed Nov 11, 2009. Strong T dependence for strained epitaxial Ba(FeCo)As thin films http://link.aip.org/link/?APL/95/192501/1&agg=rss K. Iida, J. Hanisch, R. Huhne, F. Kurth, M. Kidszun et al.<br/> Ba(FeCo)As superconducting thin films have been grown on SrTiO, (La,Sr)(Al,Ta)O, LaAlO, and YAlO (YAO) single crystal substrates by pulsed laser deposition. All the films, except on YAO, have been grown epitaxially without buffer layers. The films deposited on YAO contained 45 degrees in-plane rota ... [Appl. Phys. Lett. 95, 192501 (2009)] published Tue Nov 10, 2009. Magnetoresistance and electroresistance of highly resistive states in thin nonhomogeneous LaCaMnO films http://link.aip.org/link/?APL/95/192502/1&agg=rss S. Asmontas, F. Anisimovas, J. Gradauskas, A. Maneikis, O. KiprijanoviC et al.<br/> The magnetoresistive and electroresistive properties of thin nonhomogeneous LaCaMnO films have been investigated after thermocycling from 200 to 80 K. Highly resistive states with an additional low temperature resistance peak near 95 K were revealed in the films using probe currents as low as 1 [mu ... [Appl. Phys. Lett. 95, 192502 (2009)] published Tue Nov 10, 2009. Temperature- and magnetic-field-controlled magnetic pole reversal in a molecular magnetic compound http://link.aip.org/link/?APL/95/182506/1&agg=rss S. M. Yusuf, Amit Kumar, and J. V. Yakhmi<br/> A highly reversible (bipolar) switching of magnetization in a Prussian blue type molecular magnet CuMn[Fe(CN)]zHO using low magnetic fields is demonstrated. The studied molecular compound also shows both positive and negative magnetocaloric effects below its magnetic ordering temperature. A molecula ... [Appl. Phys. Lett. 95, 182506 (2009)] published Fri Nov 6, 2009. Observation of asymmetrical pinning of domain walls in notched Permalloy nanowires using electron holography http://link.aip.org/link/?APL/95/182507/1&agg=rss Kai He, David J. Smith, and Martha R. McCartney<br/> Field-driven domain-wall motion and pinning in notched Permalloy nanowires have been observed using electron holography and Lorentz microscopy. Transverse domain walls (TDWs) were identified and different aspects of their behavior, including nucleation, injection, pinning, and depinning, were studie ... [Appl. Phys. Lett. 95, 182507 (2009)] published Fri Nov 6, 2009. Magnetic and conductive dead layer at the LaCaMnOSrTiO:Nb interface http://link.aip.org/link/?APL/95/182509/1&agg=rss S. Liang, J. R. Sun, J. Wang, and B. G. Shen<br/> Interfacial properties of the LaCaMnO films grown on SrTiO and SrTiO:Nb, respectively, have been experimentally studied. An interface layer, ~13 or ~4.4 nm for the films on SrTiO or SrTiO:Nb, with degenerated magnetic/conductive properties is found in the film. The most remarkable result is the sig ... [Appl. Phys. Lett. 95, 182509 (2009)] published Fri Nov 6, 2009. X-ray magnetic circular dichroism studies of Fe doped fullerene and highly oriented pyrolytic graphite http://link.aip.org/link/?APL/95/182511/1&agg=rss Amit Kumar, P. Thakur, N. B. Brookes, and D. K. Avasthi<br/> We report the x-ray magnetic circular dichroism (XMCD) studies on Fe doped fullerene thin film and bulk highly oriented pyrolytic graphite. The element-specific hysteresis curves were recorded by measuring the XMCD at the Fe L edge as a function of the applied field strength at different temperature ... [Appl. Phys. Lett. 95, 182511 (2009)] published Fri Nov 6, 2009. All-optical detection of phase fronts of propagating spin waves in a NiFe microstripe http://link.aip.org/link/?APL/95/182508/1&agg=rss K. Vogt, H. Schultheiss, S. J. Hermsdoerfer, P. Pirro, A. A. Serga et al.<br/> We present the determination of the wavelength and phase of propagating spin waves in magnetic microstructures made of NiFe using the shorted end of a coplanar waveguide for local excitation. The spin wave characteristics have been measured by phase resolved Brillouin light scattering microscopy. Th ... [Appl. Phys. Lett. 95, 182508 (2009)] published Fri Nov 6, 2009. Spin-dependent intergranular transport in highly spin-polarized CoFeS thin films http://link.aip.org/link/?APL/95/182510/1&agg=rss M. Manno, R. Frakie, B. Bolon, and C. Leighton<br/> Magnetic and magnetotransport measurements on polycrystalline thin film CoFeS, a system that exhibits tunable conduction electron spin polarization in bulk, are reported. The films exhibit a low field hysteretic magnetoresistance (MR) due to spin-dependent intergranular tunneling, thus providing a s ... [Appl. Phys. Lett. 95, 182510 (2009)] published Fri Nov 6, 2009. Low-temperature magnetotransport behaviors of heavily Mn-doped (Ga,Mn)As films with high ferromagnetic transition temperature http://link.aip.org/link/?APL/95/182505/1&agg=rss L. Chen, S. Yan, P. F. Xu, J. Lu, W. Z. Wang et al.<br/> We report the low-temperature magnetotransport behaviors of (Ga,Mn)As films with the nominal Mn concentration x larger than 10%. The ferromagnetic transition temperature T can be enhanced to 191 K after postgrowth annealing (Ga,Mn)As with x=20%. The temperature T, corresponding to the resistivity mi ... [Appl. Phys. Lett. 95, 182505 (2009)] published Thu Nov 5, 2009. Time domain analyses of the converse magnetoelectric effect in a multiferroic metallic glass-relaxor ferroelectric heterostructure http://link.aip.org/link/?APL/95/182501/1&agg=rss Yajie Chen, Anton L. Geiler, Trifon Fitchorov, Carmine Vittoria, and V. G. Harris<br/> The dynamic time domain response of the converse magnetoelectric effect in a multiferroic Metglas/Pb(MgNb)OPbTiO (PMN-PT) heterostructure, under the application of a square waveform electric field excitation of 8 kV/cm at a frequency of 0.4 Hz, is reported. The relaxation behavior followed a stretch ... [Appl. Phys. Lett. 95, 182501 (2009)] published Tue Nov 3, 2009.