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15 May 2002

Volume 91, Issue 10, pp. 6227-8917

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Nonlinear magneto-optical properties of Pr1−xCaxMnO3 and Nd1−xSrxMnO3

M. Fiebig, K. Miyano, Y. Tomioka, H. Kuwahara, Y. Tokura, and K. Reimann

J. Appl. Phys. 91, 7505 (2002); http://dx.doi.org/10.1063/1.1448305 (3 pages) | Cited 1 time

Online Publication Date: 13 May 2002

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Optical three-photon difference frequency generation (DFG) was observed in Pr1−xCaxMnO3 (x=0.30, 0.40) and Nd1−xSrxMnO3 (x=0.48, 0.50). In the paramagnetic phase, the DFG signal reflects the fourfold anisotropy of the quasicubic crystal, and all the independent tensor elements for DFG near 2.0 eV are determined. Below TN≈150 K, a two-order-parameter coupling to both antiferromagnetism and charge ordering leads to additional DFG contributions which allow to observe the formation of ∼100 μm large magnetic domains. © 2002 American Institute of Physics.
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78.20.Ls Magneto-optical effects
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
75.20.Ck Nonmetals
75.60.Ch Domain walls and domain structure
75.30.Gw Magnetic anisotropy
42.65.An Optical susceptibility, hyperpolarizability

Spin waves, phase separation, and interphase boundaries in double exchange magnets

D. I. Golosov

J. Appl. Phys. 91, 7508 (2002); http://dx.doi.org/10.1063/1.1448306 (3 pages) | Cited 10 times

Online Publication Date: 13 May 2002

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We study a classical double exchange magnet with direct antiferromagnetic superexchange coupling, J, between the localized spins. It is shown that the destabilization of the ferromagnetic ground state with increasing J leads to phase separation; the latter always preempts the spin-wave instability (softening of the magnon spectrum). It is also found that the boundaries separating the ferromagnetic and antiferromagnetic areas of the sample tend to be abrupt. © 2002 American Institute of Physics.
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75.30.Ds Spin waves
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.30.Et Exchange and superexchange interactions
75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)

Spin excitations in [La1−xCaxMnO3] in the mixed-phase region

L. Stumpe, B. Kirby, H. Kaiser, J. J. Rhyne, and J. F. Mitchell

J. Appl. Phys. 91, 7511 (2002); http://dx.doi.org/10.1063/1.1448307 (3 pages) | Cited 1 time

Online Publication Date: 13 May 2002

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The magnetic excitations and the ferromagnetic order parameter have been studied by neutron scattering in a series of the manganese-based CMR perovskites [La1−xCaxMnO3] (x=0.46, 0.48, 0.50) near the metallic ferromagnetic to insulating antiferromagnetic phase. Well-defined ferromagnetic spin waves were detected for the x=0.46 and x=0.48 compositions. From the measurements of the order parameter, only the x=0.48 sample showed conclusive evidence of a coexistence of an antiferromagnetic phase with the ferromagnetic phase. For this composition, hysteresis was observed in the spin wave intensity but not in the spin stiffness parameter. This effect indicates that the ferromagnetic exchange is not perturbed by the antiferromagnetic ordering. No measurable ferromagnetic magnetization was found in the x=0.50 sample; thus no spin waves could be detected. The results indicate that the onset of the antiferromagnetism upon hole doping for the series occurs in a narrow region of x below the x=0.50 phase boundary. © 2002 American Institute of Physics.
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75.30.Ds Spin waves
75.50.Dd Nonmetallic ferromagnetic materials
71.30.+h Metal-insulator transitions and other electronic transitions
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.30.Et Exchange and superexchange interactions

Strain-dependent spin dynamics in Nd0.67Sr0.33MnO3 near the metal–insulator transition

Y. H. Ren, H. B. Zhao, G. Lüpke, Y. F. Hu, and Qi Li

J. Appl. Phys. 91, 7514 (2002); http://dx.doi.org/10.1063/1.1447289 (3 pages) | Cited 5 times

Online Publication Date: 13 May 2002

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We report on time-resolved pump–probe measurements of spin-dependent dynamics in strained Nd0.67Sr0.33MnO3 thin films grown on three different substrates: LaAlO3 (001), SrTiO3 (001), and NdGaO3 (110). The temperature dependence of the long-lived spin-relaxation component is represented well by a power-law decay of long-range correlations, clearly showing the transition from quasilong-range ferromagnetic order to a disordered paramagnetic phase. The “disordering” temperature, TM, where the intermediate phase of quasilong-range order appears, varies according to the creation of static-distortion waves under different strain forces. © 2002 American Institute of Physics.
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75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
75.50.Dd Nonmetallic ferromagnetic materials
75.70.Ak Magnetic properties of monolayers and thin films
68.60.Bs Mechanical and acoustical properties
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
72.60.+g Mixed conductivity and conductivity transitions
78.47.-p Spectroscopy of solid state dynamics

A Zener pair effect in lanthanum rutheno manganite

Ranjan K. Sahu and S. Sundar Manoharan

J. Appl. Phys. 91, 7517 (2002); http://dx.doi.org/10.1063/1.1447290 (3 pages) | Cited 10 times

Online Publication Date: 13 May 2002

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A strong correlation between the Curie temperature and the metal–insulator transition is displayed in Ru doped La0.6Pb0.4Mn1−xRuxO3, where an equiatomic ratio of Ru and Mn is present in the Mn–O–Ru sublattice. The magnetic pair making effect of Mn with Ru is facilitated by the variable valency of Ru (IV)/Ru (V) which is similar in ionic size to the Zener pair Mn (III)/Mn (IV). Further Ru, being a 4d metal with itinerant t2g electrons, facilitates the exchange coupling interaction. The spin-wave excitation and the hole carrier density dominate the magnetization and the electron transport for T<0.5 TC for a higher Ru doped composition. © 2002 American Institute of Physics.
Show PACS
75.30.Et Exchange and superexchange interactions
75.50.Dd Nonmetallic ferromagnetic materials
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
72.60.+g Mixed conductivity and conductivity transitions
78.70.Dm X-ray absorption spectra
72.20.Ht High-field and nonlinear effects
72.80.Sk Insulators
75.30.Ds Spin waves
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Intrinsic spin valves in the layered manganite La1.4Sr1.6Mn2O7

T. Nachtrab, S. Heim, M. Mößle, R. Kleiner, O. Waldmann, R. Koch, P. Müller, T. Kimura, and Y. Tokura

J. Appl. Phys. 91, 7520 (2002); http://dx.doi.org/10.1063/1.1451806 (3 pages) | Cited 3 times

Online Publication Date: 13 May 2002

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We report on transport measurements on micron-sized mesa structures fabricated on single crystals of the layered manganite La1.4Sr1.6Mn2O7, probing the magnetoresistance of a single magnetic domain for current transport perpendicular to the layers. In magnetic fields applied perpendicular to the layers switching of the magnetoresistance was observed in fields well below 0.4 T, while for parallel fields it decreased continuously. We interpret these observations within the framework of spin-polarized tunneling between adjacent MnO2 bilayers forming an intrinsic stack of spin valves. © 2002 American Institute of Physics.
Show PACS
75.47.De Giant magnetoresistance
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
73.61.Ng Insulators
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.45.+j Macroscopic quantum phenomena in magnetic systems
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