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9 Apr 2012

Volume 100, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 100, 153701 (2012); http://dx.doi.org/10.1063/1.3700446 (3 pages)

Hsiao-lu D. Lee, Steffen J. Sahl, Matthew D. Lew, and W. E. Moerner
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Magnetic-field-induced martensitic transformation in MnNiAl:Co alloys

L. Feng (冯琳), L. Ma (马丽), E. K. Liu (刘恩克), G. H. Wu (吴光恒), W. H. Wang (王文洪), and W. X. Zhang (张文星)

Appl. Phys. Lett. 100, 152401 (2012); http://dx.doi.org/10.1063/1.3701136 (3 pages) | Cited 1 time

Online Publication Date: 9 April 2012

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A series of Heusler-type MnNiCoAl alloys have been prepared, and the composition dependence of the martensitic transformation has been investigated. Due to the formation of a local Mn-Co-Mn ferromagnetic structure in the antiferromagnetic matrix, a large magnetization difference of 48 Am2/kg and a driving efficiency of 2.14 K/T can be observed in Mn50Ni32Co6Al12 sample in which a field-induced transformation can be realized. X-ray diffraction results further indicate that the high temperature phase has a high level of atomic disorder which causes an increase of the thermal hysteresis of the transformation when increasing Co content.
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81.30.Kf Martensitic transformations
64.70.K- Solid-solid transitions
75.50.Cc Other ferromagnetic metals and alloys
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
75.50.Ee Antiferromagnetics

Towards precise measurement of oscillatory domain wall by ferromagnetic Josephson junction

Shin’ichi Hikino, Michiyasu Mori, Wataru Koshibae, and Sadamichi Maekawa

Appl. Phys. Lett. 100, 152402 (2012); http://dx.doi.org/10.1063/1.3701782 (3 pages)

Online Publication Date: 10 April 2012

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We theoretically propose a principle for precise measurement of oscillatory domain wall (DW) by a ferromagnetic Josephson junction, which is composed of a ferromagnetic wire with DW and two superconducting electrodes. The current-voltage curve exhibits stepwise structures, only when DW oscillates in the ferromagnetic wire. The voltage step appears at V = n(ℏ/2e)ωDW with the fundamental constant ℏ/e, integer number n, and the DW frequency ωDW. Since V can be determined in the order of 10−9 accuracy, the oscillatory DW will be measured more precisely than present status by conventional method.
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75.60.Ch Domain walls and domain structure
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
74.50.+r Tunneling phenomena; Josephson effects

Giant reversible magnetocaloric effect in ErMn2Si2 compound with a second order magnetic phase transition

Lingwei Li, Katsuhiko Nishimura, Wayne D. Hutchison, Zhenghong Qian, Dexuan Huo, and Takahiro NamiKi

Appl. Phys. Lett. 100, 152403 (2012); http://dx.doi.org/10.1063/1.4704155 (4 pages) | Cited 10 times

Online Publication Date: 13 April 2012

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The magnetic properties and magnetocaloric effect (MCE) in the ternary intermetallic compound ErMn2Si2 have been studied by magnetization and heat capacity measurements. A giant reversible MCE has been observed, accompanied by a second order magnetic phase transition from paramagnetic to ferromagnetic at ∼4.5 K. Under a field change of 5 T, the maximum value of magnetic entropy change (−ΔSMmax) is 25.2 J kg−1 K−1 with no thermal and field hysteresis loss, and the corresponding maximum value of adiabatic temperature change (ΔTadmax) is 12.9 K. Particularly, the values of −ΔSMmax and ΔTadmax reached 20.0 J kg−1 K−1 and 5.4 K for a low field change of 2 T, respectively. The present results indicate that the ErMn2Si2 compound is an attractive candidate for low temperature magnetic refrigeration.
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75.30.Sg Magnetocaloric effect, magnetic cooling
75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
65.40.Ba Heat capacity
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Mn2PtIn: A tetragonal Heusler compound with exchange bias behavior

Ajaya K. Nayak, Chandra Shekhar, Jürgen Winterlik, Arunava Gupta, and Claudia Felser

Appl. Phys. Lett. 100, 152404 (2012); http://dx.doi.org/10.1063/1.4704160 (4 pages) | Cited 3 times

Online Publication Date: 13 April 2012

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The structural and magnetic properties of a tetragonal Heusler compound Mn2PtIn are reported. Low temperature (5 K) magnetic measurements of the material show a hard magnetic behavior with relatively low saturation magnetization of 1.6 μB/f.u., suggesting ferrimagnetic ordering in the system. Moreover, observance of shifted field-cooled hysteresis loops indicates the presence of unidirectional exchange anisotropy resulting from nano-scale interaction between ferromagnetic/antiferromagnetic clusters. An exchange bias (EB) field of 16 mT is measured at 5 K, with the value steadily decreasing with increasing temperature to zero at temperatures around 200 K. The EB behavior likely originates from the glassy nature of the low temperature magnetic state, as indicated by ac susceptibility and zero-field-cooled relaxation measurements.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Gw Magnetic anisotropy
72.15.Jf Thermoelectric and thermomagnetic effects
61.66.Dk Alloys
75.50.Ww Permanent magnets
75.50.Cc Other ferromagnetic metals and alloys
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Large piezoresistance and magnetoresistance effects on Ni45Co5Mn37.5In12.5 single crystal

L. Porcar, D. Bourgault, and P. Courtois

Appl. Phys. Lett. 100, 152405 (2012); http://dx.doi.org/10.1063/1.3701170 (3 pages) | Cited 3 times

Online Publication Date: 13 April 2012

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We report resistivity measurements as a function of magnetic field or uniaxial stress across the martensitic transformation on Ni45Co5Mn37.5In12.5 Heusler single crystal. The resistivity and transformation temperatures are strongly affected by the application of an uniaxial stress or a magnetic field and consequent magnetoresistance and piezoresistance that can reach up to 60% or 122%, respectively, are measured. This behavior opens up a large range of possible applications with a relatively small pressure or magnetic field as a control parameter to tune the resistivity.
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72.15.Gd Galvanomagnetic and other magnetotransport effects
81.30.Kf Martensitic transformations
66.70.-f Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves

Cascade-like signal propagation in chains of concave nanomagnets

Brian Lambson, Zheng Gu, David Carlton, Scott Dhuey, Andreas Scholl, Andrew Doran, Anthony Young, and Jeffrey Bokor

Appl. Phys. Lett. 100, 152406 (2012); http://dx.doi.org/10.1063/1.3703591 (4 pages) | Cited 2 times

Online Publication Date: 13 April 2012

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We lithographically control the anisotropy properties of single-domain nananomagnets for use in emerging nanomagnetic logic applications. By defining concave-shaped nanomagnets to enhance the effect of configurational anisotropy, we induce the property of dual-axis remanence needed for high-speed and reliable operation of nanomagnetic logic circuits. Magneto-optical measurements verify the anisotropy properties of isolated concave nanomagnets, and photoelectron emission microscopy measurements verify signal propagation in chains of concave nanomagnets.
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75.75.-c Magnetic properties of nanostructures
75.50.Tt Fine-particle systems; nanocrystalline materials
75.30.Gw Magnetic anisotropy
78.20.Ls Magneto-optical effects
79.60.-i Photoemission and photoelectron spectra
84.30.Sk Pulse and digital circuits
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