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12 Mar 2012

Volume 100, Issue 11, Articles (11xxxx)

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Appl. Phys. Lett. 100, 111101 (2012); http://dx.doi.org/10.1063/1.3691957 (3 pages)

Christina Alpmann, Michael Esseling, Patrick Rose, and Cornelia Denz
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Current-driven domain wall motion in heterostructured ferromagnetic nanowires

Youngman Jang, Mark D. Mascaro, G. S. D. Beach, and C. A. Ross

Appl. Phys. Lett. 100, 112401 (2012); http://dx.doi.org/10.1063/1.3692797 (5 pages) | Cited 1 time

Online Publication Date: 12 March 2012

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Micromagnetic modeling shows that the placement of non-magnetic conductive pads on a ferromagnetic wire affects the current-induced velocity of a domain wall (DW) in the wire and can act as a DW chirality filter. The pads shunt the current, causing a non-uniform spin current distribution inside the ferromagnetic wire and an Oersted field transverse to the wire. This suppresses Walker breakdown allowing higher current densities to be imposed before breakdown occurs. The transverse Oersted field pins the DW under some regimes of current density and pad geometry, selectively allowing transmission of DWs of only one chirality.
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75.60.Ch Domain walls and domain structure

Low-damping spin-wave propagation in a micro-structured Co2Mn0.6Fe0.4Si Heusler waveguide

T. Sebastian, Y. Ohdaira, T. Kubota, P. Pirro, T. Brächer, K. Vogt, A. A. Serga, H. Naganuma, M. Oogane, Y. Ando, and B. Hillebrands

Appl. Phys. Lett. 100, 112402 (2012); http://dx.doi.org/10.1063/1.3693391 (3 pages) | Cited 6 times

Online Publication Date: 13 March 2012

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We report on the investigation of spin-wave propagation in a micro-structured Co2Mn0.6Fe0.4Si (CMFS) Heusler waveguide. The reduced magnetic losses of this compound compared to the commonly used Ni81Fe19 allow for the observation of spin-wave propagation over distances as high as 75 μm via Brillouin light scattering (BLS) microscopy. In the linear regime, a maximum decay length of 16.7 μm of the spin-wave amplitude was found. The coherence length of the observed spin-wave modes was estimated to be at least 16 μm via phase-resolved BLS techniques.
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75.30.Ds Spin waves
78.35.+c Brillouin and Rayleigh scattering; other light scattering
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Conductive and ferromagnetic contributions of H in ZnCoO using H2 hot isostatic pressure

Yong Chan Cho, Seunghun Lee, Ho Hyun Nahm, Su Jae Kim, Chul Hong Park, Su Yeon Lee, Sung-Kyu Kim, Chae Ryong Cho, Hideomi Koinuma, and Se-Young Jeong

Appl. Phys. Lett. 100, 112403 (2012); http://dx.doi.org/10.1063/1.3694040 (4 pages) | Cited 1 time

Online Publication Date: 14 March 2012

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For highly H injected ZnCoO achieved by simultaneous high pressure (1000 bar) and annealing using a hot isostatic pressure (HIP), we report electrical and magnetic properties with first-principles calculation results. The HIP process increased the carrier concentration by ∼ 103 times and restored the conductivity up to that of H injected ZnO. Interestingly, with maintaining high conductivity, the extended HIP processing time significantly enhanced the short-ranged spin orderings of Co-H-Co complexes. Based on the experimental and theoretical results, we proposed the explanation for the relation magnetic characteristics and the behavior of hydrogen triggering spin ordering for spintronic applications.
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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
62.50.-p High-pressure effects in solids and liquids
75.50.Dd Nonmetallic ferromagnetic materials
72.80.Ey III-V and II-VI semiconductors
72.20.My Galvanomagnetic and other magnetotransport effects

Vortex core magnetization dynamics induced by thermal excitation

Tiago S. Machado, Tatiana G. Rappoport, and Luiz C. Sampaio

Appl. Phys. Lett. 100, 112404 (2012); http://dx.doi.org/10.1063/1.3694757 (3 pages) | Cited 1 time

Online Publication Date: 15 March 2012

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We investigate the effect of temperature on the dynamic properties of magnetic vortices in small disks. Our calculations use a stochastic version of the Landau-Lifshitz-Gilbert equation valid for finite temperatures well below the Curie critical temperature. We show that a finite temperature induces a vortex precession around the center of the disk, even in the absence of other excitation sources. We discuss the origin and implications of the appearance of such dynamics. We also show that a temperature gradient plays a role similar to that of a small constant magnetic field.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
02.50.Fz Stochastic analysis
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Giant magnetoresistance in layered manganese pnictide CaMnBi2

J. B. He, D. M. Wang, and G. F. Chen

Appl. Phys. Lett. 100, 112405 (2012); http://dx.doi.org/10.1063/1.3694760 (4 pages) | Cited 1 time

Online Publication Date: 15 March 2012

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We report the physical properties of a layered transition metal pnictide, CaMnBi2, which has a crystal structure similar to that of the superconducting iron pnictides. This compound is a bad metal with a long-range antiferromagnetic order at TN = 270 K. The linear temperature dependence of magnetic susceptibility above TN suggests that strong antiferromagnetic correlations exist in the paramagnetic state. A linear magnetic field dependence of the magnetoresistance implies the existence of the linear energy dispersion, which may result in the giant in-plane magnetoresistance (about 105% in 10 T at 2.5 K for H∥c). The results of de Haas-van Alphen effect are consistent with the presence of Dirac fermions.
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74.25.Ha Magnetic properties including vortex structures and related phenomena
74.25.Jb Electronic structure (photoemission, etc.)
75.50.Ee Antiferromagnetics
75.30.Cr Saturation moments and magnetic susceptibilities
75.47.De Giant magnetoresistance
61.66.Fn Inorganic compounds

Enhancement of the Jahn-Teller distortion by magnetization in manganites

Y. Y. Chu, H. H. Wu, S. C. Liu, Hsiu-Hau Lin, J. Matsuno, H. Takagi, J. H. Huang, J. van den Brink, C. T. Chen, and D. J. Huang

Appl. Phys. Lett. 100, 112406 (2012); http://dx.doi.org/10.1063/1.3691946 (3 pages)

Online Publication Date: 15 March 2012

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Using measurements of resonant x-ray scattering from a LaMnO3/SrMnO3 superlattice grown on SrTiO3(001), we present experimental evidence for the enhancement of the Jahn-Teller distortion by magnetic ordering in manganites. With a specially tuned periodicity of the superlattice, scattering due to the Jahn-Teller (JT) distortion is separated from charge and magnetic scattering. The measured JT distortion is markedly enhanced upon the emergence of magnetization and strongly correlated with the spin ordering in the superlattice. Such strong correlation reveals the nature of electron-electron interaction for orbital ordering in manganites.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
78.70.Ck X-ray scattering
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Effect of microstrain on the magnetism and magnetocaloric properties of MnAs0.97P0.03

N. K. Sun, F. Liu, Y. B. Gao, Z. Q. Cai, B. S. Du, S. N. Xu, and P. Z. Si

Appl. Phys. Lett. 100, 112407 (2012); http://dx.doi.org/10.1063/1.3695039 (4 pages)

Online Publication Date: 16 March 2012

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In the compound MnAs0.97P0.03, prepared by mechanical milling, a large microstrain of 0.68%, calculated by quantitative x-ray diffraction analysis, induces a recoverable helimagnetic state at low temperatures and suppresses the temperature/field-induced orthorhombic-hexagonal phase transition. This leads to a remarkable reduction of both the thermal and the magnetic hysteresis at the Curie temperature, TC. Around the helimagnetic-ferromagnetic transition temperature and at TC, a large inverse magnetocaloric effect (MCE) with magnetic entropy change ΔSm of 5.6 J/kg K at 208 K and a normal MCE with ΔSm of −4.4 J/kg K at 253 K for a 5 T field change are observed. After annealing, MnAs0.97P0.03 exhibits a large MCE near room temperature with ΔSm of ∼14 J/kg K for a field change from 0 to 5 T.
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75.30.Sg Magnetocaloric effect, magnetic cooling
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.60.Nt Magnetic annealing and temperature-hysteresis effects

Exchange anisotropy in the nanostructured MnAl system

F. Jiménez-Villacorta, J. L. Marion, T. Sepehrifar, M. Daniil, M. A. Willard, and L. H. Lewis

Appl. Phys. Lett. 100, 112408 (2012); http://dx.doi.org/10.1063/1.3695153 (4 pages) | Cited 1 time

Online Publication Date: 16 March 2012

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In this letter, we report on the achievement of exchange anisotropy magnitude in a nanostructured Mn55Al45 alloy fabricated by rapid solidification with large exchange bias values (HE ≈ 13 kOe at 10 K) and a blocking temperature of TB ∼ 95 K. Field-cooled magnetization loops show a prominent exchange bias for T < TB signaling the simultaneous presence of antiferromagnetic and ferromagnetic phases at these temperatures. Structural probes confirm a majority presence of the high-temperature metastable hexagonal ɛ-MnAl in the as-solidified state with an intriguing double-Bragg peak structure indicative of phase separation. The observed exchange bias is hypothesized to originate from an intimate mixture of antiferromagnetic and nanoscaled ferromagnetic phases or dual mictomagnetic phases, approximating a cluster glass with well-defined variations in the local Mn concentration of the composition and leading to Mn-rich and Mn-poor regions with antiferromagnetic and ferromagnetic characters, respectively.
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81.05.Bx Metals, semimetals, and alloys
75.50.Cc Other ferromagnetic metals and alloys
75.50.Ee Antiferromagnetics
75.30.Gw Magnetic anisotropy
75.30.Et Exchange and superexchange interactions
75.75.-c Magnetic properties of nanostructures
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