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2 May 2005

Volume 86, Issue 18, Articles (18xxxx)

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Appl. Phys. Lett. 86, 181101 (2005); http://dx.doi.org/10.1063/1.1920407 (3 pages)

Giacomo Scalari, Nicolas Hoyler, Marcella Giovannini, and Jérôme Faist
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Strain and anisotropy effects on spin waves in epitaxial La0.67Sr0.33MnO3 films

D. Talbayev, H. Zhao, G. Lüpke, J. Chen, and Qi Li

Appl. Phys. Lett. 86, 182501 (2005); http://dx.doi.org/10.1063/1.1922073 (3 pages) | Cited 7 times

Online Publication Date: 25 April 2005

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Uniform magnetization precession in the ferromagnetic state of La0.67Sr0.33MnO3 films grown on different substrates is investigated in the 50–300 K temperature range in magnetic fields of up to 1.3 T. The precession was induced by an optical pump pulse and probed by a time-delayed pulse using magneto-optical Kerr effect. The measured field dependence of the precession frequency agrees well with calculation from the Landau-Lifshitz-Gilbert equation using different uniaxial anisotropies for different substrates. The field-dependent relaxation times of the exponentially decaying precession are in 100–1400 ps range.
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75.50.Dd Nonmetallic ferromagnetic materials
75.30.Gw Magnetic anisotropy
75.70.Ak Magnetic properties of monolayers and thin films
75.30.Ds Spin waves
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
78.20.Ls Magneto-optical effects
78.47.-p Spectroscopy of solid state dynamics

Pd/Ag and Pd/Au interface specific resistances and interfacial spin flipping

C. Galinon, K. Tewolde, R. Loloee, W.-C. Chiang, S. Olson, H. Kurt, W. P. Pratt, J. Bass, P. X. Xu, Ke Xia, and M. Talanana

Appl. Phys. Lett. 86, 182502 (2005); http://dx.doi.org/10.1063/1.1920421 (3 pages) | Cited 15 times

Online Publication Date: 25 April 2005

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We measured the specific resistances, 2ARPd/Ag and 2ARPd/Au (sample area A times resistance R), and spin-flip probabilities δPd/Ag and δPd/Au for Pd/Ag and Pd/Au interfaces with current perpendicular to the interfaces. 2ARPd/Ag = 0.7±0.15 fΩm2 and 2ARPd/Au = 0.45±0.15 fΩm2 are smaller than our revised estimate of 2ARPd/Cu = 0.85±0.15 fΩm2, and lie further from no-free-parameter calculations. Our estimates of δPd/Ag = 0.15±0.08 and δPd/Ag = 0.08±0.08 are less than our prior estimate of δPd/Cu ∼ 0.24.
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73.40.Jn Metal-to-metal contacts

Evolution of ferromagnetic circular dichroism coincident with magnetization and anomalous Hall effect in Co-doped rutile TiO2

H. Toyosaki, T. Fukumura, Y. Yamada, and M. Kawasaki

Appl. Phys. Lett. 86, 182503 (2005); http://dx.doi.org/10.1063/1.1922569 (3 pages) | Cited 29 times

Online Publication Date: 26 April 2005

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Magnetic circular dichroism (MCD) of rutile Ti1−xCoxO2−δ is systematically examined with various x and δ to reveal a phase diagram for the appearance of ferromagnetism at higher carrier concentration and Co content. The phase diagram exactly matches with that determined from anomalous Hall effect (AHE). The magnetic field dependence of MCD also shows good coincidence with those of the magnetization and AHE. The coincidence of these independent measurements strongly suggests single and intrinsic ferromagnetic origin.
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75.50.Pp Magnetic semiconductors
72.20.My Galvanomagnetic and other magnetotransport effects
75.50.Dd Nonmetallic ferromagnetic materials
78.20.Ls Magneto-optical effects
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Phase control through anisotropic strain in Nd0.5Sr0.5MnO3 thin films

Masao Nakamura, Yasushi Ogimoto, Hiroharu Tamaru, Makoto Izumi, and Kenjiro Miyano

Appl. Phys. Lett. 86, 182504 (2005); http://dx.doi.org/10.1063/1.1923754 (3 pages) | Cited 47 times

Online Publication Date: 27 April 2005

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Strain effect in charge- and orbital-ordered state has been investigated for Nd0.5Sr0.5MnO3 thin films deposited on (100), (110), and (111)-oriented substrates of SrTiO3. Films on (001) and (111) substrates have a monotonous temperature dependence for magnetic and transport properties showing no first-order phase transition. On the other hand, films on (110) substrate show a clear ferromagnetic-antiferromagnetic and metal-insulator transition around 170 K similar to that in a bulk single crystal, which is a manifestation of the charge and orbital order. Precise control of the hole concentration was also demonstrated around half doping.
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73.61.Ng Insulators
72.60.+g Mixed conductivity and conductivity transitions
71.45.-d Collective effects
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
68.60.Bs Mechanical and acoustical properties
71.30.+h Metal-insulator transitions and other electronic transitions

Planar magnetoinductive lens for three-dimensional subwavelength imaging

M. J. Freire and R. Marqués

Appl. Phys. Lett. 86, 182505 (2005); http://dx.doi.org/10.1063/1.1922074 (3 pages) | Cited 68 times

Online Publication Date: 28 April 2005

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A planar near-field magnetoinductive lens operating in the microwave range is presented. The proposed device consists of two parallel planar arrays of metallic broadside coupled (BC) split-ring resonators (SRRs), or BC-SRRs. The power coming from a point-like source located in front of the lens is focused into a receiver located in free space beyond the lens. This focus is clearly separated from the back side of the lens, and has a size that is an order of magnitude smaller than the free space wavelength of the incoming field. The imaging properties of the device relies mainly on the excitation of magnetoinductive surface waves on the BC-SRR arrays. By simply scaling the BC-SRRs’ size, as well as the arrays periodicity, the operation frequency of the device can be tuned in a wide frequency range. Thus, the proposed design is potentially useful for many applications ranging from megahertz to terahertz.
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84.40.-x Radiowave and microwave (including millimeter wave) technology
07.57.-c Infrared, submillimeter wave, microwave and radiowave instruments and equipment

Circumferential-mode, quasi-ring-type, magnetoelectric laminate composite—a highly sensitive electric current and∕or vortex magnetic field sensor

Shuxiang Dong, John G. Bai, Junyi Zhai, Jie-Fang Li, G.-Q. Lu, D. Viehland, Shujun Zhang, and T. R. Shrout

Appl. Phys. Lett. 86, 182506 (2005); http://dx.doi.org/10.1063/1.1923184 (3 pages) | Cited 24 times

Online Publication Date: 28 April 2005

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A quasi-ring-type magnetoelectric (ME) laminate composite consisting of a circumferentially poled piezoelectric Pb(Zn1/3Nb2/3O)3‐4.5 at. % PbTiO3single-crystal ring and two circumferentially magnetized magnetostrictive TERFENOL-D rings was fabricated and found to have a giant ME voltage coefficient of 2.2 V/Oe, or equivalently a ME field coefficient of 5.5 V/cm Oe, over the frequency range of 0.5<f<105 Hz. This circumferential-mode quasiring ME laminate can detect ac currents (noncontact) as small as 10−7 A, and∕or a vortex magnetic field as small as 6×10−12 Tesla. In addition, we demonstrated current sensing capability of the quasiring laminate in a power electronics module.
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75.80.+q Magnetomechanical effects, magnetostriction
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
85.70.Ec Magnetostrictive, magnetoacoustic, and magnetostatic devices
07.55.-w Magnetic instruments and components

Large negative magnetoresistance in quaternary Heusler alloy Ni50Mn8Fe17Ga25 melt-spun ribbons

Z. H. Liu, H. Liu, X. X. Zhang, X. K. Zhang, John Q. Xiao, Z. Y. Zhu, X. F. Dai, G. D. Liu, J. L. Chen, and G. H. Wu

Appl. Phys. Lett. 86, 182507 (2005); http://dx.doi.org/10.1063/1.1925783 (3 pages) | Cited 15 times

Online Publication Date: 29 April 2005

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Quaternary Heusler alloy Ni50Mn8Fe17Ga25 ribbons have been prepared by the melt-spun method. The ribbons exhibit large negative magnetoresistance (MR){ = [R(H)−R(0)]/R(0)} over a wide temperature region, particularly in the region during the martensitic phase transformation. The MR decreases significantly after annealing. The large MR is isotropic and is mainly attributed to the local magnetic disorders, magnetic clusters, and heterogeneity. The maximum MR at martensitic transformation may be due to the redistribution of electrons and the increase of phase boundary scattering. This feature adds a useful functionality to the already interesting Heusler alloys.
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81.05.Bx Metals, semimetals, and alloys
75.50.Bb Fe and its alloys
75.47.De Giant magnetoresistance
64.70.K- Solid-solid transitions
81.20.-n Methods of materials synthesis and materials processing
81.40.Gh Other heat and thermomechanical treatments
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