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Thermal spin injection and interface insensitivity in permalloy/aluminum metallic nonlocal spin valves (2016)

A. Hojem, D. Wesenberg, and B. L. Zink

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-07-22

Description: Author(s): A. Hojem, D. Wesenberg, and B. L. Zink In a wide range of experiments where electrical currents are used to inject angular momentum, or spin currents, from a metallic ferromagnet into a nonmagnetic metal, the interface plays a critical role. Whether in the giant magnetoresistance effect or in nonlocal spin valves, a loss of spin polarization of an electrical current crossing the interface is seen to reduce the spin current and lead to smaller overall response in sensors. The authors here compare electrical spin injection to the more recently discovered thermal spin injection in a nonlocal spin valve. They show that, despite a strong reduction of electrical spin injection that they tie to the loss of interfacial spin polarization, thermal spin injection remains a large effect. This highlights that thermal spin injection (also called the spin-dependent Seebeck effect) can proceed by new physical mechanisms not possible in the electrically driven case, potentially involving incoherent spin pumping and collective behavior of magnetization in the oxidized interface layer. Better understanding of these interface effects could lead to new ways to increase sensitivity of next-generation magnetic sensors and efficiency of sources of spin current in metallic systems. [Phys. Rev. B 94, 024426] Published Thu Jul 21, 2016

Keywords: Magnetism

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

Published by American Physical Society (APS)

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Efficient spin transport through native oxides of nickel and permalloy with platinum and gold overlayers (2016)

B. L. Zink, M. Manno, L. O'Brien, J. Lotze, M. Weiler, D. Bassett, S. J. Mason, S. T. B. Goennenwein, M. Johnson, and C. Leighton

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2016-05-04

Description: Author(s): B. L. Zink, M. Manno, L. O'Brien, J. Lotze, M. Weiler, D. Bassett, S. J. Mason, S. T. B. Goennenwein, M. Johnson, and C. Leighton We present measurements of spin pumping detected by the inverse spin Hall effect voltage and ferromagnetic resonance spectroscopy in a series of metallic ferromagnet/normal metal thin film stacks. We compare heterostructures grown in situ to those where either a magnetic or nonmagnetic oxide is intr… [Phys. Rev. B 93, 184401] Published Mon May 02, 2016

Keywords: Magnetism

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

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Peltier Cooling and Onsager Reciprocity in Ferromagnetic Thin Films (2013)

A. D. Avery and B. L. Zink

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2013-09-18

Description: Author(s): A. D. Avery and B. L. Zink We present direct measurements of the Peltier effect as a function of temperature from 77 to 325 K in Ni, Ni 80 Fe 20 , and Fe thin films made using a suspended Si-N membrane structure. Measurement of the Seebeck effect in the same films allows us to directly test predictions of Onsager reciprocity betw... [Phys. Rev. Lett. 111, 126602] Published Tue Sep 17, 2013

Keywords: Condensed Matter: Electronic Properties, etc.

Print ISSN: 0031-9007

Electronic ISSN: 1079-7114

Topics: Physics

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On the potentially dramatic history of the super-Earth {rho} 55 Cancri e (2015)

Hansen, B. M. S., Zink, J.

Oxford University Press

In: Monthly Notices of the Royal Astronomical Society

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Publication Date: 2015-05-24

Description: We demonstrate that tidal evolution of the inner planet (‘e’) of the system orbiting the star 55 Cancri could have led to passage through two secular resonances with other planets in the system. The consequence of this evolution is excitation of both the planetary eccentricity and inclination relative to the original orbital plane. The large mass ratio between the innermost planet and the others means that these excitations can be of substantial amplitude and can have dramatic consequences for the system organization. Such evolution can potentially explain the large observed mutual inclination between the innermost and outermost planets in the system, and implies that tidal heating could have substantially modified the structure of planet e, and possibly reduced its mass by Roche lobe overflow. Similar inner secular resonances may be found in many multiple planet systems and suggest that many of the innermost planets in these systems could have suffered similar evolutions.

Print ISSN: 0035-8711

Electronic ISSN: 1365-2966

Topics: Physics

Published by Oxford University Press

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f-Mode Instability in Relativistic Neutron Stars (2011)

E. Gaertig, K. Glampedakis, K. D. Kokkotas, and B. Zink

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-09-03

Description: Author(s): E. Gaertig, K. Glampedakis, K. D. Kokkotas, and B. Zink We present the first calculation of the basic properties of the f -mode instability in rapidly rotating relativistic neutron stars, adopting the Cowling approximation. By accounting for dissipation in neutron star matter, i.e., shear or bulk viscosity and superfluid mutual friction, we calculate the ... [Phys. Rev. Lett. 107, 101102] Published Fri Sep 02, 2011

Keywords: Gravitation and Astrophysics

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Electronic ISSN: 1079-7114

Topics: Physics

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Determining the planar Nernst effect from magnetic-field-dependent thermopower and resistance in nickel and permalloy thin films (2012)

A. D. Avery, M. R. Pufall, and B. L. Zink

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-09

Description: Author(s): A. D. Avery, M. R. Pufall, and B. L. Zink We present magnetic-field-dependent measurements of thermopower, α (H), and resistance, R ( H ), for Ni 80 Fe 20 and Ni thin films. We conducted these experiments in fields oriented parallel and perpendicular to the applied thermal gradient, ∇ ⃗ T , for α (H) and applied current for R ( H ). We deposited the 20-n... [Phys. Rev. B 86, 184408] Published Thu Nov 08, 2012

Keywords: Magnetism

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

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Thermal and electrical conductivity of approximately 100-nm permalloy, Ni, Co, Al, and Cu films and examination of the Wiedemann-Franz Law (2015)

A. D. Avery, S. J. Mason, D. Bassett, D. Wesenberg, and B. L. Zink

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2015-12-10

Description: Author(s): A. D. Avery, S. J. Mason, D. Bassett, D. Wesenberg, and B. L. Zink We present measurements of thermal and electrical conductivity of polycrystalline permalloy (Ni-Fe), aluminum, copper, cobalt, and nickel thin films with thickness 〈 200 nm. A micromachined silicon-nitride membrane thermal-isolation platform allows measurements of both transport properties on a si… [Phys. Rev. B 92, 214410] Published Tue Dec 08, 2015

Keywords: Magnetism

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Universal Relaxation Governs the Nonequilibrium Elasticity of Biomolecules (2012)

Christian Kappel, Nicole Dölker, Rajendra Kumar, Mareike Zink, Ulrich Zachariae, and Helmut Grubmüller

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-09-15

Description: Author(s): Christian Kappel, Nicole Dölker, Rajendra Kumar, Mareike Zink, Ulrich Zachariae, and Helmut Grubmüller Experimental and computational dynamic force spectroscopy is widely used to determine the mechanical properties of single biomolecules. Whereas so far the focus has mainly been on rupture or unfolding forces, recent force-probe molecular dynamics simulations have revealed a strong loading rate depen... [Phys. Rev. Lett. 109, 118304] Published Fri Sep 14, 2012

Keywords: Soft Matter, Biological, and Interdisciplinary Physics

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Electronic ISSN: 1079-7114

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Thermopower and resistivity in ferromagnetic thin films near room temperature (2011)

A. D. Avery, Rubina Sultan, D. Bassett, D. Wei, and B. L. Zink

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-03-04

Description: Author(s): A. D. Avery, Rubina Sultan, D. Bassett, D. Wei, and B. L. Zink We present measurements of thermopower (Seebeck coefficient) and electrical resistivity of a wide selection of polycrystalline ferromagnetic films with thicknesses ranging from 60–167 nm. For comparison, a copper film of similar thickness was measured with the same techniques. Both the thermal and... [Phys. Rev. B 83, 100401] Published Thu Mar 03, 2011

Keywords: Magnetism

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Stability of general-relativistic accretion disks (2011)

Oleg Korobkin, Ernazar B. Abdikamalov, Erik Schnetter, Nikolaos Stergioulas, and Burkhard Zink

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-02-19

Description: Author(s): Oleg Korobkin, Ernazar B. Abdikamalov, Erik Schnetter, Nikolaos Stergioulas, and Burkhard Zink Self-gravitating relativistic disks around black holes can form as transient structures in a number of astrophysical scenarios such as binary neutron star and black hole-neutron star coalescences, as well as the core collapse of massive stars. We explore the stability of such disks against runaway a... [Phys. Rev. D 83, 043007] Published Fri Feb 18, 2011

Keywords: D15

Print ISSN: 0556-2821

Electronic ISSN: 1089-4918

Topics: Physics

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