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1 Sep 2008

Volume 93, Issue 9, Articles (09xxxx)

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Appl. Phys. Lett. 93, 091901 (2008); http://dx.doi.org/10.1063/1.2976330 (3 pages)

Fang-Fang Ren, M. B. Yu, J. D. Ye, Q. Chen, S. T. Tan, G. Q. Lo, and D. L. Kwong
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Thick YBa2Cu3O7−x+BaSnO3 films with enhanced critical current density at high magnetic fields

C. V. Varanasi, J. Burke, H. Wang, J. H. Lee, and P. N. Barnes

Appl. Phys. Lett. 93, 092501 (2008); http://dx.doi.org/10.1063/1.2976683 (3 pages) | Cited 8 times

Online Publication Date: 2 September 2008

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The thickness dependence was studied for the critical current density (Jc) of YBa2Cu3O7−x(YBCO)+BaSnO3 (BSO) nanocomposite films. These films showed a significantly reduced decline of the Jc with thickness, especially at high magnetic fields. For example, a 2 μm thick YBCO+BSO film had a Jc ∼ 3×105 A/cm2 at 5 T as compared to a typical Jc of 2.4×103 A/cm2 at 5 T for a 300 nm thick YBCO film. The thick YBCO+BSO films maintained high Tc (>88 K) and had a high density (2.5×1011/cm2) of continuous BSO nanocolumns that likely contributed for the observed Jc enhancements.
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74.25.Sv Critical currents
74.72.-h Cuprate superconductors
74.78.-w Superconducting films and low-dimensional structures

Spin polarization tuning in Mn5−xFexGe3

A. Stroppa, G. Kresse, and A. Continenza

Appl. Phys. Lett. 93, 092502 (2008); http://dx.doi.org/10.1063/1.2977469 (3 pages) | Cited 3 times

Online Publication Date: 2 September 2008

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Experimentally, the intermetallic compound Mn4FeGe3 has been recently shown to exhibit enhanced magnetic properties and spin polarization compared to the Mn5Ge3 parent compound. The present ab initio study focuses on the effect of Fe substitution on the electronic and magnetic properties of the compound. Our calculations reveal that the changes on the Fermi surface of the doped compound are remarkable, and provide explanations for the enhanced spin polarization observed. Finally, we show that it is indeed possible to tune the degree of spin polarization upon Fe doping, thus making the Mn5−xFexGe3 intermetallic alloy very promising for future spintronic applications.
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72.25.Ba Spin polarized transport in metals
71.18.+y Fermi surface: calculations and measurements; effective mass, g factor
75.30.Cr Saturation moments and magnetic susceptibilities
71.15.-m Methods of electronic structure calculations
61.72.up Other materials
75.50.Bb Fe and its alloys

Magnetic phase transition in Zn1−xMnxO doped by nitrogen

Sh. U. Yuldashev, Kh. T. Igamberdiev, T. W. Kang, V. O. Pelenovich, and A. G. Shashkov

Appl. Phys. Lett. 93, 092503 (2008); http://dx.doi.org/10.1063/1.2969411 (3 pages) | Cited 4 times

Online Publication Date: 2 September 2008

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The specific heat measurement was used to study the magnetic phase transition in Zn0.95Mn0.05O. The magnetization dependencies on the magnetic field, M(H) curve, and on the temperature, M(T) curve measured by superconducting quantum interference device, indicate the ferromagnetic-paramagnetic phase transition in Zn0.95Mn0.05O doped by nitrogen has a Curie temperature of about 80 K. The temperature dependence of the specific heat reveals a pronounced λ shaped peak at 75 K for the nitrogen-doped sample. Such dependencies indicate a well defined second-order phase transition in this sample.
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75.50.Pp Magnetic semiconductors
75.50.Dd Nonmetallic ferromagnetic materials
75.20.Ck Nonmetals
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Reduction in critical current density for spin torque transfer switching with composite free layer

Cheng-Tyng Yen, Wei-Chuan Chen, Ding-Yeong Wang, Yuan-Jen Lee, Chih-Ta Shen, Shan-Yi Yang, Ching-Hsiang Tsai, Chien-Chung Hung, Kuei-Hung Shen, Ming-Jinn Tsai, and Ming-Jer Kao

Appl. Phys. Lett. 93, 092504 (2008); http://dx.doi.org/10.1063/1.2978097 (3 pages) | Cited 17 times

Online Publication Date: 3 September 2008

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A composite free layer (CFL) consisting of a soft layer and a hard layer exchange coupled in parallel is proposed. The experimental results showed that the critical current density (Jc) can be reduced from 7.05×106 A/cm2 of strong coupled CoFeB(12.5 Å)/Ru(4 Å)/NiFe(17.5 Å) CFL to 2.65×106 A/cm2 of weak coupled CoFeB(12.5 Å)/Ru(15 Å)/NiFe(17.5 Å) CFL. The macrospin simulations showed that the soft layer of CFL can assist the hard layer of CFL to switch at a lower Jc. These results suggest that by using CFL, it is possible to reduce the Jc of spin torque transfer switching without compromising the thermal stability.
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74.25.Sv Critical currents
75.50.Bb Fe and its alloys
72.25.Mk Spin transport through interfaces
75.50.Ww Permanent magnets
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Solid phase epitaxy of ferrimagnetic Y3Fe5O12 garnet thin films

Y. Krockenberger, H. Matsui, T. Hasegawa, M. Kawasaki, and Y. Tokura

Appl. Phys. Lett. 93, 092505 (2008); http://dx.doi.org/10.1063/1.2976747 (3 pages) | Cited 3 times

Online Publication Date: 3 September 2008

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Epitaxial Y3Fe5O12 thin films were grown on (111) Gd3Ga5O12 substrates by pulsed laser deposition and subsequent annealing above 1270 K. The as-grown films deposited at temperatures below 1070 K were amorphous and the absence of trivalent iron ions has been verified by electron spin resonance spectroscopy. The ex situ annealing above 1270 K in oxygen atmosphere converted the films into epitaxial ones with ferrimagnetic properties. The higher temperature annealing up to 1670 K enabled the higher TC and the shorter lattice constant approaching those of bulk, while the saturation magnetization stayed at 2μB/f.u. at 300 K. Slightly expanded lattice constants and reduced saturation magnetization values may originate from oxygen deficient crystal structures. Nonetheless, the epitaxial films preserved a fairly smooth surface with a root mean square roughness below 2 nm.
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81.15.Np Solid phase epitaxy; growth from solid phases
75.50.Gg Ferrimagnetics
81.40.Gh Other heat and thermomechanical treatments
81.15.Fg Pulsed laser ablation deposition
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
76.30.Lh Other ions and impurities

Magnetic and magneto-optical properties of Fe-doped SrTiO3 films

Hyun-Suk Kim, Lei Bi, G. F. Dionne, and C. A. Ross

Appl. Phys. Lett. 93, 092506 (2008); http://dx.doi.org/10.1063/1.2977963 (3 pages) | Cited 17 times

Online Publication Date: 4 September 2008

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Epitaxial films of magnetically doped SrTi1−xFexO3 (x ⩽ 0.5) were grown on (001) LaAlO3 substrates by pulsed laser deposition. Structural and magnetic studies indicate that the observed ferromagnetism is intrinsic rather than from an impurity phase. The higher transparency with Fe doping is attributed to charge compensation resulting from hole doping by Fe incorporation into the SrTiO3 lattice. SrTi0.6Fe0.4O3 has a reasonably high Faraday rotation of 0.078 deg/μm accompanied by low optical loss (0.07 dB/μm), which makes it a promising candidate for integrated waveguide isolator applications.
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75.70.Ak Magnetic properties of monolayers and thin films
78.20.Ls Magneto-optical effects
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
75.50.Dd Nonmetallic ferromagnetic materials
81.15.Fg Pulsed laser ablation deposition

Fluid-flow characterization with nuclear spins without magnetic resonance

C. W. Crawford, Shoujun Xu, Eric J. Siegel, Dmitry Budker, and Alexander Pines

Appl. Phys. Lett. 93, 092507 (2008); http://dx.doi.org/10.1063/1.2977773 (3 pages) | Cited 2 times

Online Publication Date: 5 September 2008

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A technique for noninvasive monitoring of flow inside metallic enclosures using laser-based atomic magnetometry is introduced. The analyte is labeled via nuclear magnetization by magnets, thereby combining the polarization and encoding steps. No radiofrequency or audiofrequency pulses are involved. We demonstrate detection of flow inside an aluminum pipe with an inner diameter of 4.9 mm that has a constriction with a diameter of 1.6 mm and a length of 6.4 mm. The results agree with a model of spin density and relaxation indicating that our technique allows for fast, quantitative, and noninvasive diagnostics of flow with potential applications discussed below.
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07.55.-w Magnetic instruments and components
42.62.Eh Metrological applications; optical frequency synthesizers for precision spectroscopy
47.80.-v Instrumentation and measurement methods in fluid dynamics
47.60.Dx Flows in ducts and channels
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