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2 Aug 2010

Volume 97, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 97, 051101 (2010); http://dx.doi.org/10.1063/1.3470591 (3 pages)

Pascal Böhi, Max F. Riedel, Theodor W. Hänsch, and Philipp Treutlein
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Reverse-domain superconductivity in superconductor-ferromagnet hybrids: Effect of a vortex-free channel on the symmetry of I-V characteristics

A. Yu. Aladyshkin, D. Yu. Vodolazov, J. Fritzsche, R. B. G. Kramer, and V. V. Moshchalkov

Appl. Phys. Lett. 97, 052501 (2010); http://dx.doi.org/10.1063/1.3474622 (3 pages) | Cited 5 times

Online Publication Date: 2 August 2010

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We demonstrate experimentally that the presence of a single domain wall in an underlying ferromagnetic BaFe12O19 substrate can induce a considerable asymmetry in the current (I)–voltage (V) characteristics of a superconducting Al bridge deposited on top of the substrate. The observed diodelike effect, i.e., polarity-dependent critical current, is associated with the formation of a vortex-free channel inside the superconducting area which increases the total current flowing through the superconducting bridge without dissipation. The vortex-free region appears only for a certain sign of the injected current and for a limited range of the external magnetic field.
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74.25.F- Transport properties
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.30.Gw Magnetic anisotropy
74.78.-w Superconducting films and low-dimensional structures

Electrically controlled magnetization switching in a multiferroic heterostructure

Yajie Chen, Trifon Fitchorov, Carmine Vittoria, and V. G. Harris

Appl. Phys. Lett. 97, 052502 (2010); http://dx.doi.org/10.1063/1.3475417 (3 pages) | Cited 12 times

Online Publication Date: 2 August 2010

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A demonstration of magnetization reversal via the application of electric field across a multiferroic heterostructure, consisting of a FeCoV ribbon bonded to a lead magnesium niobate-lead titanate crystal, is presented. The magnetization switching occurs by an abrupt change in magnetization near ferromagnetic coercivity, coinciding with an electrical field-induced magnetic anisotropy field. Experiments reveal a converse magnetoelectric coupling of α = μ0(dM/dE) = 1.6×10−7 s m−1 upon magnetization reversal in the strain-mediated heterostructure. The frequency dependence of magnetization switching is presented and explained within the framework of a relaxation model for the multiferroic heterostructure.
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75.85.+t Magnetoelectric effects, multiferroics
75.60.Jk Magnetization reversal mechanisms
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Gw Magnetic anisotropy
77.80.-e Ferroelectricity and antiferroelectricity
75.78.Jp Ultrafast magnetization dynamics and switching

Reversibility and irreversibility of magnetocaloric effect in a metamagnetic shape memory alloy under cyclic action of a magnetic field

V. V. Khovaylo, K. P. Skokov, O. Gutfleisch, H. Miki, R. Kainuma, and T. Kanomata

Appl. Phys. Lett. 97, 052503 (2010); http://dx.doi.org/10.1063/1.3476348 (3 pages) | Cited 14 times

Online Publication Date: 3 August 2010

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We have studied adiabatic temperature change ΔTad in a Ni50Mn36Co1Sn13 metamagnetic shape memory alloy. An irreversible character of ΔTad has been observed in the vicinity of the reverse martensitic transformation. In this region, cyclic application of the magnetic field converts comparatively large inverse magnetocaloric effect (MCE) with ΔTadmax = −0.8 K to a weaker conventional MCE (ΔTadmax = 0.3 K). The crossover of ΔTad has been attributed to the irreversible character of the magnetic field-induced transformation and the closeness of the martensitic transformation and Curie temperature of the austenitic phase TCA.
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75.30.Sg Magnetocaloric effect, magnetic cooling
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
81.40.Lm Deformation, plasticity, and creep
64.70.K- Solid-solid transitions
62.20.fg Shape-memory effect; yield stress; superelasticity

Inverted hysteresis and giant exchange bias in La0.7Sr0.3MnO3/SrRuO3 superlattices

M. Ziese, I. Vrejoiu, and D. Hesse

Appl. Phys. Lett. 97, 052504 (2010); http://dx.doi.org/10.1063/1.3470101 (3 pages) | Cited 13 times

Online Publication Date: 3 August 2010

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The magnetization reversal mechanisms in a La0.7Sr0.3MnO3/SrRuO3 superlattice with ultrathin individual layers were studied. Due to the strong exchange bias between La0.7Sr0.3MnO3 and SrRuO3 layers inverted hysteresis loops were observed at temperatures below 62 K; at higher temperatures the superlattice showed an unconventional reversal mechanism with the magnetically hard SrRuO3 layers switching first on reducing the magnetic field from saturation. These observations were corroborated by micromagnetic simulations and were interpreted as arising from interfacial Bloch walls.
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74.25.Ha Magnetic properties including vortex structures and related phenomena
75.60.Jk Magnetization reversal mechanisms
74.70.-b Superconducting materials other than cuprates
74.78.Fk Multilayers, superlattices, heterostructures
75.30.Et Exchange and superexchange interactions
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Bulk sensitive x-ray absorption and magnetic circular dichroism investigation of Mn- and Co-doped ZnO thin films

A. Di Trolio, R. Larciprete, S. Turchini, and N. Zema

Appl. Phys. Lett. 97, 052505 (2010); http://dx.doi.org/10.1063/1.3475925 (3 pages) | Cited 4 times

Online Publication Date: 4 August 2010

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Bulk sensitive L2,3 x-ray magnetic circular dichroism spectra were measured in transmission on Mn- and Co-doped ZnO thin films grown by pulsed laser deposition on soft x-ray transparent silicon nitride membranes. The absorption spectra line shapes support that Mn and Co divalent ions substitute Zn ions ruling out the hint of cluster formation. The lack of dichroic signal at the Mn and Co-edges in such bulk sensitive measurements indicates that the ferromagnetism witnessed by vibrating sample magnetometry measurements could arise from delocalized magnetic moments, due to itinerant electrons associated with defects.
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78.20.Ls Magneto-optical effects
75.30.Cr Saturation moments and magnetic susceptibilities
78.66.Hf II-VI semiconductors
81.15.Fg Pulsed laser ablation deposition
61.72.U- Doping and impurity implantation
78.70.Dm X-ray absorption spectra

Investigation of the intermediate phase and magnetocaloric properties in high-pressure annealing Ni–Mn–Co–Sn alloy

S. C. Ma, H. C. Xuan, C. L. Zhang, L. Y. Wang, Q. Q. Cao, D. H. Wang, and Y. W. Du

Appl. Phys. Lett. 97, 052506 (2010); http://dx.doi.org/10.1063/1.3476351 (3 pages) | Cited 3 times

Online Publication Date: 5 August 2010

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The Ni–Mn–Co–Sn alloy is prepared by high-pressure annealing method. Besides the enhanced martensitic transformation temperature and the Curie temperature of austenite, an intermediate phase above the martensitic transformation is observed in this alloy. As a result, two successive magnetic entropy changes with the same sign are obtained around room-temperature, corresponding to the martensitic transformation and intermediate phase transition, respectively. The origin of the intermediate phase for high-pressure annealing Ni–Mn–Co–Sn alloy is discussed.
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75.30.Sg Magnetocaloric effect, magnetic cooling
62.50.-p High-pressure effects in solids and liquids
81.30.Kf Martensitic transformations
81.40.Gh Other heat and thermomechanical treatments
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Magnetic domain compensation effect on the magnetodynamic response of ferromagnetic elements

C. Patschureck, R. Kaltofen, I. Mönch, R. Schäfer, L. Schultz, and J. McCord

Appl. Phys. Lett. 97, 052507 (2010); http://dx.doi.org/10.1063/1.3474621 (3 pages)

Online Publication Date: 6 August 2010

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The capacity to tune the ferromagnetic resonance frequency in a soft ferromagnetic film relies on the ability to tailor the uniaxial anisotropy of the film material. We achieved a systematic change in anisotropy field with all other material properties remaining constant by preparing Ni18Fe19/Co60Fe20B20 multilayers. We show that in patterned films deviations from the regular Landau domain pattern occur, which compensate magnetic anisotropy effects and thereby lead to a precessional frequency independent of anisotropy. These results demonstrate that even small changes in the magnetic domain structure counteracts anisotropy adjustments in optimizing the magnetodynamic response in mesoscopic thin film elements.
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75.60.Ch Domain walls and domain structure
75.50.Bb Fe and its alloys
75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.30.Gw Magnetic anisotropy
73.21.Ac Multilayers
71.70.Di Landau levels
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