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We study temperature evolution of spin accumulation signals obtained by the three-terminal Hanle effect measurements in a nondegenerated silicon channel with a Schottky-tunnel-barrier contact. We find the clear difference in the…

介观与纳米尺度物理 · 物理学 2012-01-31 Y. Ando , K. Kasahara , S. Yamada , Y. Maeda , K. Masaki , Y. Hoshi , K. Sawano , M. Miyao , K. Hamaya

We demonstrate the reduction of critical spin-transfer torque (STT) switching currents in Co-Fe-B/MgO based magnetic tunnel junctions (MTJ) with perpendicular magnetization anisotropy (PMA). The junctions yield tunnel magnetoresistance…

Thermoelectric effects in magnetic nanostructures and the so-called spin caloritronics are attracting much interest. Indeed it provides a new way to control and manipulate spin currents which are key elements of spin-based electronics. Here…

Using the Hamiltonian formulation of Composite Fermions developed recently, the temperature dependence of the spin polarization is computed for the translationally invariant fractional quantum Hall states at $\nu=1/3$ and $\nu=2/5$ in two…

介观与纳米尺度物理 · 物理学 2009-10-31 Ganpathy Murthy

We present spin transfer switching results for MgO based magnetic tunneling junctions (MTJs)with large tunneling magnetoresistance (TMR) ratio of up to 150% and low intrinsic switching current density of 2-3 x 10 MA/cm2. The switching data…

其他凝聚态物理 · 物理学 2009-11-11 Zhitao Diao , Dmytro Apalkov , Mahendra Pakala , Alex Panchula , Yiming Huai

We use the Boltzmann transport theory in the relaxation time approximation to describe the thermal transport of spin waves in a ferromagnet. By treating spin waves as magnon excitations we are able to compute analytically and numerically…

材料科学 · 物理学 2018-09-05 Vittorio Basso , Elena Ferraro , Marco Piazzi

Magnetic tunnel junctions are nanoscale devices which have recently attracted interested in the context of frequency multiplexed spintronic neural networks, due to their interesting dynamical properties, which are defined during the…

应用物理 · 物理学 2024-08-29 Maksim Stebliy , Alex S. Jenkins , Luana Benetti , Elvira Paz , Ricardo Ferreira

We use scanning optical magnetometry to study the broadband frequency spectra of spontaneous magnetization fluctuations, or "magnetization noise", in an archetypal ferromagnetic film that can be smoothly tuned through a spin reorientation…

材料科学 · 物理学 2018-09-26 A. L. Balk , F. Li , I. Gilbert , J. Unguris , N. A. Sinitsyn , S. A. Crooker

The temperature dependence of the giant magnetoresistance (GMR) for currents parallel and perpendicular to the multilayer plane, is discussed by taking account of the random exchange potentials, phonon scatterings and spin fluctuations. The…

凝聚态物理 · 物理学 2009-10-28 Hideo Hasegawa

We report the possibility of achieving an order of magnitude reduction in the energy dissipation needed to write bits in perpendicular magnetic tunnel junctions (p-MTJs) by simulating the magnetization dynamics under a combination of…

介观与纳米尺度物理 · 物理学 2019-10-02 Austin Roe , Dhritiman Bhattacharya , Jayasimha Atulasimha

Using ferromagnetic-resonance spectroscopy (FMR), we investigate the anisotropic properties of epitaxial 3 nmPt/2 nmAg/10 nmFe/10 nmAg/GaAs(001) films in fully saturated meta-stable states at temperatures ranging from 70 K to 280 K. By…

The magnetic tunnel junctions (MTJ) based on van der Waals (vdW) materials possess atomically smooth interfaces with minimal element intermixing. This characteristic ensures that spin polarization is well maintained during transport,…

应用物理 · 物理学 2024-02-23 Shouguo Zhu , Hailong Lin , Wenkai Zhu , Weihao Li , Jing Zhang , Kaiyou Wang

This work presents an equivalent circuit model for Magnetic Tunnel Junctions (MTJs) that accurately captures their magnetization dynamics and electrical behavior. Implemented in LTspice, the model is validated against direct numerical…

介观与纳米尺度物理 · 物理学 2025-05-20 Steven Louis , Hannah Bradley , Artem Litvinenko , Vasyl Tyberkevych

Spin fluctuations are a leading candidate for the pairing mechanism in high temperature superconductors, supported by the common appearance of a distinct resonance in the spin susceptibility across the cuprates, iron-based superconductors…

Flexible electronics is an emerging field in many applications ranging from in vivo biomedical devices to wearable smart systems. The capability of conforming to curved surfaces opens the door to add electronic components to miniaturized…

Modulation of a spin-torque oscillator (STO) signal based on a magnetic tunnel junction (MTJ) with perpendicularly magnetized free layer is investigated. Magnetic field inductive loop was created during MTJ fabrication process, which…

Non-invasive measurement of absolute temperature is important for proper characterization of various pathologies and for evaluation of thermal dose during interventional procedures. The proton magnetic resonance (MR) frequency shift method…

医学物理 · 物理学 2019-05-31 Emilia Silletta , Alexej Jerschow , Guillaume Madelin , Leeor Alon

Efficient generation of spin currents from charge currents is of high importance for memory and logic applications of spintronics. In particular, generation of spin currents from charge currents in high spin-orbit coupling metals has the…

The writing energy for reversing the magnetization of the free layer in a magnetic tunnel junction (MTJ) is a key figure of merit for comparing the performances of magnetic random access memories with competing technologies. Magnetization…

Spin-dependent charge transport in magnetic tunnel junctions (MTJs) can be manipulated by a temperature gradient, which can be utilized for spintronic and spin caloritronic applications. Evaluation of the thermally induced phenomena…

材料科学 · 物理学 2020-02-12 Hyejin Jang , Luca Marnitz , Torsten Huebner , Johannes Kimling , Timo Kuschel , David G. Cahill