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12 Apr 2010

Volume 96, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 96, 153701 (2010); http://dx.doi.org/10.1063/1.3385388 (3 pages)

Sinan Keten and Markus J. Buehler
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Giant reversible magnetocaloric effect in metamagnetic HoCuSi compound

J. Chen, B. G. Shen, Q. Y. Dong, F. X. Hu, and J. R. Sun

Appl. Phys. Lett. 96, 152501 (2010); http://dx.doi.org/10.1063/1.3386536 (3 pages) | Cited 16 times

Online Publication Date: 12 April 2010

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The magnetic properties and magnetocaloric effect (MCE) of antiferromagnetic HoCuSi compound have been studied. It is found that HoCuSi undergoes a field-induced first order metamagnetic transition from antiferromagnetic (AFM) to ferromagnetic (FM) states below the Néel temperature (TN). A giant MCE without hysteresis loss is observed in HoCuSi around TN. The maximal magnetic entropy change (−ΔSM) and refrigerant capacity are 33.1 J/kgK and 385 J/kg, respectively, for a field change of 0–5 T. The excellent magnetocaloric properties can result from the field-induced AFM-FM transition below TN and the increase in magnetization change caused by the change in lattice volume at TN.
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75.30.Sg Magnetocaloric effect, magnetic cooling
75.50.Ee Antiferromagnetics
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
61.66.Dk Alloys

Gilbert damping in perpendicularly magnetized Pt/Co/Pt films investigated by all-optical pump-probe technique

S. Mizukami, E. P. Sajitha, D. Watanabe, F. Wu, T. Miyazaki, H. Naganuma, M. Oogane, and Y. Ando

Appl. Phys. Lett. 96, 152502 (2010); http://dx.doi.org/10.1063/1.3396983 (3 pages) | Cited 22 times

Online Publication Date: 13 April 2010

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To investigate the correlation between perpendicular magnetic anisotropy and intrinsic Gilbert damping, time-resolved magneto-optical Kerr effect was measured in Pt/Co(dCo)/Pt films. These films showed perpendicular magnetization at dCo = 1.0 nm and a perpendicular magnetic anisotropy energy Kueff that was inversely proportional to dCo. With an analysis based on the Landau–Lifshitz–Gilbert equation, the intrinsic Gilbert damping constant α was evaluated by parameter-fitting of frequency and lifetime expressions to experimental data of angular variations in spin precession frequency and life-times. The α values increased significantly with decreasing dCo but not inversely proportional to dCo.
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75.70.Ak Magnetic properties of monolayers and thin films
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
78.20.Ls Magneto-optical effects
75.30.Gw Magnetic anisotropy

Ferromagnetic and ordered MnSi(111) epitaxial layers

E. Magnano, F. Bondino, C. Cepek, F. Parmigiani, and M. C. Mozzati

Appl. Phys. Lett. 96, 152503 (2010); http://dx.doi.org/10.1063/1.3392373 (3 pages) | Cited 4 times

Online Publication Date: 14 April 2010

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We report a comprehensive study of ordered MnSi films grown on Si(111) which provides clear proofs that these MnSi films have the same magnetic and electronic properties of bulk MnSi compound, so closing a long-standing question. Furthermore, our measurements show the presence of a room-temperature ferromagnetic transition consistent with the ferromagnetic ground state predicted for Mn atoms with reduced coordination near surfaces and interfaces of silicon by recent calculations of Hortamani et al. [Phys. Rev. B 78, 104402 (2008)] . The possibility of growing layers on semiconductors which are ferromagnetic at room temperature (RT) is of paramount importance for nonvolatile memories and spintronic devices based on the injection of spin-polarized current from a ferromagnetic metal into a semiconductor. In this perspective MnSi films grown on Si substrates represent an interesting case study.
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81.05.Hd Other semiconductors
81.15.-z Methods of deposition of films and coatings; film growth and epitaxy
68.55.A- Nucleation and growth
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.70.Ak Magnetic properties of monolayers and thin films
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Current driven discontinuous insulator-metal transition and low-field colossal magnetoresistance in Sm0.6Sr0.4MnO3

A. Rebello and R. Mahendiran

Appl. Phys. Lett. 96, 152504 (2010); http://dx.doi.org/10.1063/1.3386535 (3 pages) | Cited 4 times

Online Publication Date: 15 April 2010

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We show that with increasing magnitude of current (I), insulator-metal (I-M) transition in Sm0.6Sr0.4MnO3 becomes discontinuous and shifts down in temperature, which is accompanied by an abrupt decrease in temperature of the sample while cooling. The I-M transition exhibits a hysteresis while warming. A magnetic field of μ0H = 0.5 T results in −99% magnetoresistance for I = 11 mA compared to −32% for I = 1 mA. Our results underscore the importance of inhomogeneous Joule heating that leads to coexistence of the high temperature paramagnetic phase with the low temperature ferromagnetic phase over a wide temperature range.
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75.47.Gk Colossal magnetoresistance
75.47.Lx Magnetic oxides
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
72.60.+g Mixed conductivity and conductivity transitions
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Perpendicular magnetic anisotropy in Co/Pt multilayers studied from a view point of anisotropy of magnetic Compton profiles

M. Ota, M. Itou, Y. Sakurai, A. Koizumi, and H. Sakurai

Appl. Phys. Lett. 96, 152505 (2010); http://dx.doi.org/10.1063/1.3374881 (3 pages) | Cited 3 times

Online Publication Date: 15 April 2010

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Magnetic Compton profiles (MCPs) of Co/Pt multilayers have been measured from a view point of perpendicular magnetic anisotropy (PMA). The PMA and the MCPs are discussed in the present Co/Pt results together with the previous Co/Pd results. The anisotropies of the MCPs have been decomposed into each magnetic quantum number |m| = 0, 1, and 2. The decomposition analysis has suggested that the |m| = 1 state contributes to the PMA when the multilayer films change in-plane magnetic anisotropy to the PMA, and that the |m| = 2 state contributes to the PMA when the multilayer films have large PMA energy.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.30.Gw Magnetic anisotropy
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
78.70.-g Interactions of particles and radiation with matter

Direct imaging of current induced magnetic vortex gyration in an asymmetric potential well

Andre Bisig, Jan Rhensius, Matthias Kammerer, Michael Curcic, Hermann Stoll, Gisela Schütz, Bartel Van Waeyenberge, Kang Wei Chou, Tolek Tyliszczak, Laura J. Heyderman, Stephen Krzyk, Arndt von Bieren, and Mathias Kläui

Appl. Phys. Lett. 96, 152506 (2010); http://dx.doi.org/10.1063/1.3373590 (3 pages) | Cited 4 times

Online Publication Date: 16 April 2010

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Employing time-resolved x-ray microscopy, we investigate the dynamics of a pinned magnetic vortex domain wall in a magnetic nanowire. The gyrotropic motion of the vortex core is imaged in response to an exciting ac current. The elliptical vortex core trajectory at resonance reveals asymmetries in the local potential well that are correlated with the pinning geometry. Using the analytical model of a two-dimensional harmonic oscillator, we determine the resonance frequency of the vortex core gyration and, from the eccentricity of the vortex core trajectory at resonance, we can deduce the stiffness of the local potential well.
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75.60.Ch Domain walls and domain structure
75.75.Fk Domain structures in nanoparticles
75.78.Fg Dynamics of domain structures
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
75.50.Tt Fine-particle systems; nanocrystalline materials
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