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31 Aug 2009

Volume 95, Issue 9, Articles (09xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 95, 091901 (2009); http://dx.doi.org/10.1063/1.3212896 (3 pages)

Noy Bassik, George M. Stern, and David H. Gracias
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Enhancement in the field sensitivity of magnetoelectric laminate heterostructures

J. Das, J. Gao, Z. Xing, J. F. Li, and D. Viehland

Appl. Phys. Lett. 95, 092501 (2009); http://dx.doi.org/10.1063/1.3222914 (3 pages) | Cited 29 times

Online Publication Date: 2 September 2009

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The effect of magnetostrictive layer thickness on the magnetoelectric (ME) response and field sensitivity of Pb(Zr,Ti)O3-metglas based sandwiched ME heterostructures has been studied. Such structures hold promise for sensor applications. The increase in metglas thickness results in a significant increase in the ME response and magnetic field sensitivity. The ME coefficient and field sensitivity increase by about 1.5–1.75 and 2.7 times, respectively, for a structure with 150 μm thick six metglas layers on both sides of the Pb(Zr,Ti)O3, in comparison to a 50 μm thick two layered structure.
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75.80.+q Magnetomechanical effects, magnetostriction
61.43.Fs Glasses
77.55.-g Dielectric thin films
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Microscopic origin of training in exchange bias system

Amitesh Paul and Stefan Mattauch

Appl. Phys. Lett. 95, 092502 (2009); http://dx.doi.org/10.1063/1.3211857 (3 pages) | Cited 14 times

Online Publication Date: 2 September 2009

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The microscopic origin of training in exchange coupled systems has been identified from our experimentally observed microscopic suppression of training. It is an interplay of uniaxial anisotropy and uncompensated spins in the antiferromagnet grains that are rotatable in polycrystalline antiferromagnetic layer similar to spin-glass-like behavior.
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75.30.Gw Magnetic anisotropy
75.50.Ee Antiferromagnetics
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Three-dimensional spin structure in exchange-biased antiferromagnetic/ferromagnetic thin films

R. Morales, M. Vélez, O. Petracic, Igor V. Roshchin, Z.-P. Li, X. Batlle, J. M. Alameda, and Ivan K. Schuller

Appl. Phys. Lett. 95, 092503 (2009); http://dx.doi.org/10.1063/1.3216055 (3 pages) | Cited 6 times

Online Publication Date: 2 September 2009

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A coexistence of lateral and in-depth domain walls in antiferromagnet/ferromagnet (AF/FM) thin films exhibiting double hysteresis loops (DHLs) is demonstrated. Comparison of single and DHLs together with local and global measurements confirms the formation of two oppositely oriented domains in the AF that imprint a lateral domain structure into the FM layer. Most significantly, the magnetization reversal mechanism within each opposite domain takes place by incoherent rotation of spring-like domain walls extending through the Ni thickness. Therefore, complex three-dimensional domain walls are created perpendicular and parallel to the AF/FM interface in exchange biased systems.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.70.Ak Magnetic properties of monolayers and thin films
75.50.Ee Antiferromagnetics
75.50.Dd Nonmetallic ferromagnetic materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.60.Jk Magnetization reversal mechanisms
71.70.Gm Exchange interactions
75.30.Et Exchange and superexchange interactions
75.70.Kw Domain structure (including magnetic bubbles and vortices)

Possible origins of the magnetoresistance gain in colossal magnetoresistive oxide La0.69Ca0.31MnO3: Structure fluctuation and pinning effect on magnetic domain walls

X. Z. Yu, Run-Wei Li, T. Asaka, K. Ishizuka, K. Kimoto, and Y. Matsui

Appl. Phys. Lett. 95, 092504 (2009); http://dx.doi.org/10.1063/1.3216589 (3 pages) | Cited 6 times

Online Publication Date: 2 September 2009

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The spatial fluctuation of the magnetic domain (MD) and charge/orbital ordering (CO/OO) structure at around the Curie temperature (TC) was directly observed in a colossal magnetoresistance (CMR) compound, La0.69Ca0.31MnO3, in which extraordinary anisotropic magnetoresistance (AMR) has also been observed. It was found that the long range MD structure collapses upon the emergence of short range CO/OO in a narrow temperature regime, which provides abundant evidence in support of a gain in magnetoresistance at around TC. Moreover, the pinning effect on the MD wall was discerned and it may contribute to the CMR as well as to the extraordinary AMR effect.
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75.47.Gk Colossal magnetoresistance
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.30.Ds Spin waves
75.60.Ch Domain walls and domain structure
71.20.Ps Other inorganic compounds
61.72.Mm Grain and twin boundaries

Superconducting quantum interference device amplifiers with over 27 GHz of gain-bandwidth product operated in the 4–8 GHz frequency range

Lafe Spietz, Kent Irwin, and José Aumentado

Appl. Phys. Lett. 95, 092505 (2009); http://dx.doi.org/10.1063/1.3220061 (3 pages) | Cited 8 times

Online Publication Date: 3 September 2009

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We describe the performance of amplifiers in the 4–8 GHz range using direct current (dc) superconducting quantum interference devices (SQUIDs) in a lumped element configuration. We have used external impedance transformers to couple power into and out of the dc SQUIDs. By choosing appropriate values for coupling capacitors, resonator lengths and output component values, we have demonstrated useful gains in several frequency ranges with different bandwidths, showing over 27 GHz of power gain-bandwidth product. In this work, we describe our design for the 4–8 GHz range and present data demonstrating gain, bandwidth, dynamic range, and drift characteristics.
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85.25.Dq Superconducting quantum interference devices (SQUIDs)
84.30.Le Amplifiers

Enhanced magnetic refrigeration capacity in phase separated manganites

A. L. Lima Sharma, P. A. Sharma, S. K. McCall, S.-B. Kim, and S.-W. Cheong

Appl. Phys. Lett. 95, 092506 (2009); http://dx.doi.org/10.1063/1.3204694 (3 pages) | Cited 13 times

Online Publication Date: 4 September 2009

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Multiple phase transitions and magnetic phase coexistence lead to a negative magnetocaloric effect in a wide temperature range of ∼ 10–250 K in La0.215Pr0.41Ca0.375MnO3. A large fraction of the magnetocaloric effect originates from the low temperature phase separated state, which is composed of coexisting, magnetic field dependent charge ordered, and ferromagnetic regions. While the maximum isothermal entropy change is modest, the persistence of the field-dependent phase separated state over a ∼ 240 K temperature span yields a refrigeration capacity of ∼ 3.2 J/cm3. Materials with magnetic field dependent phase separation can therefore be used to improve regenerative magnetic refrigerators.
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75.30.Sg Magnetocaloric effect, magnetic cooling
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.)
75.50.Dd Nonmetallic ferromagnetic materials
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