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1 Jun 2009

Volume 94, Issue 22, Articles (22xxxx)

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Appl. Phys. Lett. 94, 221101 (2009); http://dx.doi.org/10.1063/1.3143652 (3 pages)

Gangyi Xu, Virginie Moreau, Yannick Chassagneux, Adel Bousseksou, Raffaele Colombelli, G. Patriarche, G. Beaudoin, and I. Sagnes
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“All-Heusler alloy” current-perpendicular-to-plane giant magnetoresistance

Konstantin Nikolaev, Paul Kolbo, Taras Pokhil, Xilin Peng, Yonghua Chen, Thomas Ambrose, and Oleg Mryasov

Appl. Phys. Lett. 94, 222501 (2009); http://dx.doi.org/10.1063/1.3126962 (3 pages) | Cited 25 times

Online Publication Date: 1 June 2009

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A materials system of ternary full Heusler alloys exhibiting substantial current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) has been theoretically proposed and experimentally realized. Observed trends in magnetoresistance are broadly consistent with the modeling results. A CPP-GMR of 6.7% and ΔRA of 4 mΩ μm2 have been demonstrated in the bottom spin-valve configuration. The spin-stand testing of narrow-track recording heads confirmed compatibility of these materials with hard disk drive reader technology.
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75.47.De Giant magnetoresistance
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
75.50.Ss Magnetic recording materials

Magnetocaloric effect in preferentially textured Mn50Ni40In10 melt spun ribbons

B. Hernando, J. L. Sánchez Llamazares, V. M. Prida, D. Baldomir, D. Serantes, M. Ilyn, and J. González

Appl. Phys. Lett. 94, 222502 (2009); http://dx.doi.org/10.1063/1.3147875 (3 pages) | Cited 13 times

Online Publication Date: 1 June 2009

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Inverse and direct magnetocaloric properties were evaluated in preferentially textured Mn50Ni40In10 ribbons applying the magnetic field H∥ along the ribbon length and perpendicular H⊥ to the ribbon plane (ΔH = 30 kOe). Maximum magnetic entropy change, hysteretic losses, and refrigerant capacity were not significantly affected by crystallographic texture. Refrigeration capacity around structural transition is strongly reduced by the large hysteretic losses associated to the metamagnetic field-induced reverse martensitic transformation and narrower working temperature range making the interval around the magnetic transition more efficient for a refrigerant cycle (RCstruct = 71 J kg−1 versus RCstructeff ≈ 60 J kg−1, and RCmagn = 89–86 J kg−1, for H∥ and H⊥, respectively).
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75.30.Sg Magnetocaloric effect, magnetic cooling
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
65.40.gd Entropy
81.30.Kf Martensitic transformations

Planar superconductor/ferromagnet hybrids: Anisotropy of resistivity induced by magnetic templates

A. Yu. Aladyshkin, J. Fritzsche, and V. V. Moshchalkov

Appl. Phys. Lett. 94, 222503 (2009); http://dx.doi.org/10.1063/1.3149698 (3 pages) | Cited 6 times

Online Publication Date: 4 June 2009

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We investigated experimentally the transport properties of a superconducting cross-shaped aluminum microbridge fabricated on top of a ferromagnetic BaFe12O19 single crystal. It was demonstrated that a one-dimensional domain structure in the ferromagnetic substrate can induce the formation of superconducting channels above magnetic domains. This leads to a giant anisotropy of resistivity of the superconducting bridge, caused by the appearance of continuous paths of supercurrents flowing along domain walls.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Dd Nonmetallic ferromagnetic materials
75.30.Gw Magnetic anisotropy
74.25.F- Transport properties
74.25.Ha Magnetic properties including vortex structures and related phenomena
75.60.Ch Domain walls and domain structure
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