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Related papers: Local magnetoresistance in Fe/MgO/Si lateral spin …

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We report giant magnetoresistance up to 150 percent at low bias current and low temperature as well as room temperature magnetoresistance in polymeric spin-valves having the structure LSMO/conjugated polymer/Co. The conjugated polymers,…

Materials Science · Physics 2016-08-31 Sayani Majumdar , Himadri S. Majumdar , Reino Laiho , Ronald Osterbacka

We investigate the behavior of both pure spin and spin-polarized currents measured with four probe non-local and two probe local configurations up to room temperature and under external gate voltage in a lateral graphene transistor,…

We study the local and non-local magnetoresistance of thin Pt strips deposited onto yttrium iron garnet. The local magnetoresistive response, inferred from the voltage drop measured along one given Pt strip upon current-biasing it, shows…

A large spin-accumulation voltage of more than 1.5 mV at 1 mA, i.e., a magnetoresistance of 1.5 {\Omega}, was measured by means of the local three-terminal magnetoresistance in nondegenerate Si-based lateral spin valves (LSVs) at room…

We report the successful fabrication of lateral organic spin valves with a channel length in the sub $100\,nm$ regime. The fabication process is based on in-situ shadow evaporation under UHV conditions and therefore yields clean and…

Materials Science · Physics 2013-04-25 M. Grünewald , J. Kleinlein , F. Syrowatka , F. Würthner , L. W. Molenkamp , G. Schmidt

We report local and non-local measurements in pin-hole dominated mesoscopic multigraphene spin-valves. Local spin-valve measurements show spurious switching behavior in resistance during magnetic field sweeping similar to the signal…

Mesoscale and Nanoscale Physics · Physics 2012-12-11 P. K. Muduli , J. Barzola-Quiquia , S. Dusari , Ana Ballestar , F. Bern , W. Bohlmann , P. Esquinazi

Motivated by recent experiments, where the tunnel magnetoresitance (TMR) of a spin valve was measured locally, we theoretically study the distribution of TMR along the surface of magnetized electrodes. We show that, even in the absence of…

Mesoscale and Nanoscale Physics · Physics 2015-06-17 R. C. Roundy , D. Nemirovsky , V. Kagalovsky , M. E. Raikh

We observed spin injection into silicon through Fe/MgO tunnel barrier by using non-local magnetoresistance measurement technique. Fe/MgO tunnel barrier contacts with a lateral spin valve structure were fabricated on phosphorous doped…

To augment the magnetoresistance (MR) ratio of n-type non-degenerate Si-based lateral spin valves (Si-LSVs), we modify the doping profile in the Si layer and introduce a larger local strain into the Si channel by changing a capping…

Applied Physics · Physics 2020-09-01 H. Koike , S. Lee , R. Ohshima , E. Shigematsu , M. Goto , S. Miwa , Y. Suzuki , T. Sasaki , Y. Ando , M. Shiraishi

We report on a local spin valve effect observed unambiguously in lateral all-semiconductor all-electrical spin injection devices, employing p+-(Ga,Mn)As/n+-GaAs Esaki diode structures as spin aligning contacts. We discuss the observed local…

Materials Science · Physics 2010-11-11 Mariusz Ciorga , Christian Wolf , Andreas Einwanger , Martin Utz , Dieter Schuh , Dieter Weiss

We study the electrical injection and detection of spin currents in a lateral spin valve device, using permalloy (Py) as ferromagnetic injecting and detecting electrodes and copper (Cu) as non-magnetic metal. Our multi-terminal geometry…

Mesoscale and Nanoscale Physics · Physics 2007-05-23 F. J. Jedema , M. S. Nijboer , A. T. Filip , B. J. van Wees

We investigated the spin-dependent transport properties of a lateral spin-valve device with a 600 nm-long GaAs channel and ferromagnetic MnGa electrodes with perpendicular magnetization. Its current-voltage characteristics show nonlinear…

Mesoscale and Nanoscale Physics · Physics 2020-02-24 Koki Chonan , Nguyen Huynh Duy Khang , Masaaki Tanaka , Pham Nam Hai

We demonstrate the injection and detection of electrically and thermally generated spin currents probed in Co$_2$MnSi/Cu lateral spin valves. Devices with different electrode separations are patterned to measure the non-local signal as a…

Mesoscale and Nanoscale Physics · Physics 2015-09-30 Alexander Pfeiffer , Shaojie Hu , Robert M. Reeve , Alexander Kronenberg , Martin Jourdan , Takashi Kimura , Mathias Kläui

We report magnetoresistance for current flow through iron/topological insulator (Fe/TI) and Fe/evaporated-oxide/TI contacts when a magnetic field is used to initially orient the magnetic alignment of the incorporated ferromagnetic Fe bar,…

Mesoscale and Nanoscale Physics · Physics 2016-08-24 Sarmita Majumder , Samaresh Guchhait , Rik Dey , Leonard Franklin Register , Sanjay K. Banerjee

We have investigated the magnetoresistance of ferromagnet-semiconductor devices in an InAs two-dimensional electron gas system in which the magnetic field has a sinusoidal profile. The magnetoresistance of our device is large. The…

Mesoscale and Nanoscale Physics · Physics 2015-06-25 Jinki Hong , Sungjung Joo , Tae-Suk Kim , Kungwon Rhie , K. H. Kim , S. U. Kim , B. C. Lee , Kyung-Ho Shin

Tunneling magnetoresistance (TMR) in a vertical manganite junction was investigated by low-temperature scanning laser microscopy (LTSLM) allowing to determine the local relative magnetization M orientation of the two electrodes as a…

We have fabricated (Ga,Mn)As nanostructures in which domain walls can be pinned by sub-10 nm constrictions. Controlled by shape anisotropy, we can switch the regions on either side of the constriction to either parallel or antiparallel…

Mesoscale and Nanoscale Physics · Physics 2009-11-10 C. Ruester , T. Borzenko , C. Gould , G. Schmidt , L. W. Molenkamp , X. Liu , T. J. Wojtowicz , J. K. Furdyna , Z. G. Yu , M. E. Flatte

We consider a microscopic theory for the spin Hall magnetoresistance (SMR). We generally formulate a spin conductance at an interface between a normal metal and a magnetic insulator in terms of spin susceptibilities. We reveal that SMR is…

Mesoscale and Nanoscale Physics · Physics 2020-11-17 Takeo Kato , Yuichi Ohnuma , Mamoru Matsuo

We achieve tunneling spin injection from Co into single layer graphene (SLG) using TiO2 seeded MgO barriers. A non-local magnetoresistance ({\Delta}RNL) of 130 {\Omega} is observed at room temperature, which is the largest value observed in…

Mesoscale and Nanoscale Physics · Physics 2010-11-17 Wei Han , K. Pi , K. M. McCreary , Yan Li , Jared J. I. Wong , A. G. Swartz , R. K. Kawakami

Following the recent discovery of large magnetoresistance at room temperature in polyfluorence sandwich devices, we have performed a comprehensive magnetoresistance study on a set of organic semiconductor sandwich devices made from…

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