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We investigate the effect of coupling (intensity and nature), applied field, and anisotropy on the spin dynamics of a multi-layer system composed of a hard magnetic slab coupled to a soft magnetic slab through a nonmagnetic spacer. The soft…

Materials Science · Physics 2015-06-12 Andres Felipe Franco , Hamid Kachkachi

The independent control of two magnetic electrodes and spin-coherent transport in magnetic tunnel junctions are strictly required for tunneling magnetoresistance, while junctions with only one ferromagnetic electrode exhibit tunneling…

Theoretical investigations of spin transfer torque in magnetic tunnel junctions using the tight-binding model in the framework of non-equilibrium Green functions formalism are presented. We show that the behavior of the spin transfer torque…

Materials Science · Physics 2009-11-13 M. Chshiev , I. Theodonis , A. Kalitsov , N. Kioussis , W. H. Butler

Molecular bridges covalently bonded to two ferromagnetic electrodes can transform ferromagnetic materials and produce intriguing spin transport characteristics. This paper discusses the impact of molecule induced strong coupling on spin…

Materials Science · Physics 2019-12-04 Pawan Tyagi , Edward Friebe

We study interlayer exchange coupling (IEC) based on the many-body Coulomb interaction between conduction electrons in magnetic tunnel junction (MTJ). This mechanism complements the known IEC based on virtual electron hopping (or spin…

Mesoscale and Nanoscale Physics · Physics 2017-04-10 O. G. Udalov , I. S. Beloborodov

Spins in molecular magnets can experience both anisotropic exchange interactions and on-site magnetic anisotropy. In this paper we study the effect of exchange anisotropy on the molecular magnetic anisotropy both with and without on-site…

Materials Science · Physics 2018-12-12 Sumit Haldar , Rajamani Raghunathan , Jean-Pascal Sutter , S. Ramasesha

Since it is undesirable to require an external magnetic field for on-chip memory applications, we investigate the use of a Rashba effective field alternatively for assisting the electric-field-induced switching operation of a three terminal…

Mesoscale and Nanoscale Physics · Physics 2018-08-01 Jiefang Deng , Xuanyao Fong , Gengchiau Liang

We consider layered decorated honeycomb lattices at two-thirds filling, as realized in some trinuclear organometallic complexes. Localized $S=1$ moments with a single-spin anisotropy emerge from the interplay of Coulomb repulsion and spin…

Strongly Correlated Electrons · Physics 2017-11-15 J. Merino , A. C. Jacko , A. L. Khosla , B. J. Powell

We investigate scaling of technologically relevant magnetic tunnel junction devices in the trilayer and pentalayer configurations by varying the cross-sectional area along the transverse direction using the non-equilibrium Green's function…

Mesoscale and Nanoscale Physics · Physics 2018-09-24 Debasis Das , Ashwin Tulapurkar , Bhaskaran Muralidharan

Recent research has indicated that introducing impurities that increase the resistivity of Pt can enhance the efficiency of the spin Hall torque it generates. Here we directly demonstrate the usefulness of this strategy by fabricating…

In a recent article, A. Chen et al. claimed that they have switched (rotated by ~90 degrees) the magnetization of the soft layer of a magnetic tunnel junction (MTJ) in a non-volatile way with volatile strain by exploiting dipole interaction…

Mesoscale and Nanoscale Physics · Physics 2022-03-17 Supriyo Bandyopadhyay

We present magnetization measurements on the single molecule magnet Mn6, revealing various tunnel transitions inconsistent with a giant-spin description. We propose a dimeric model of the molecule with two coupled spins S=6, which involves…

Mesoscale and Nanoscale Physics · Physics 2008-10-06 S. Bahr , C. J. Milios , L. F. Jones , E. K. Brechin , V. Mosser , W. Wernsdorfer

Manipulation of tunneling spin-polarized electrons via a ferroelectric interlayer sandwiched between two ferromagnetic electrodes, dubbed Multiferroic Tunnel Junctions (MFTJs), can be achieved not only by the magnetic alignments of two…

Materials Science · Physics 2019-11-26 Mei Fang , Sangjian Zhang , Wenchao Zhang , Lu Jiang , Eric Vetter , Ho Nyung Lee , Xiaoshan Xu , Dali Sun , Jian Shen

Magnetic straintronics, the strain-mediated control of magnetic anisotropy, has emerged as a key direction for next-generation energy-efficient technologies. In multiferroic heterostructures, magnetoelectric coupling is typically achieved…

Transport signatures of exchange gap opening because of magnetic proximity effect (MPE) are reported for bilayer structures of Bi2Se3 thin films on yttrium iron garnet (YIG) and thulium iron garnet (TmIG) of perpendicular magnetic…

Applied Physics · Physics 2019-07-31 S. R. Yang , Y. T. Fanchiang , C. C. Chen , C. C. Tseng , Y. C. Liu , M. X. Guo , M. Hong , S. F. Lee , J. Kwo

The thermodynamics of a spin-1/2 magnetic multilayer system with antiferromagnetic interplanar couplings is studied using the Pair Approximation method. The special attention is paid to magnetocaloric properties, quantified by isothermal…

Materials Science · Physics 2014-09-09 Karol Szałowski , Tadeusz Balcerzak

The exchange bias effect is commonly used to shift the coercive field of a ferromagnet. This technique is crucial for the use of magnetic tunnel junctions as logic or memory devices. Therefore, an independent switching of the two…

Materials Science · Physics 2015-05-13 Niclas Teichert , Alexander Boehnke , Anna Behler , Bruno Weise , Anja Waske , Andreas Hütten

It has been shown that the spin Hall effect from heavy transition metals can generate sufficient spin-orbit torque and further produce current-induced magnetization switching in the adjacent ferromagnetic layer. However, if the…

Mesoscale and Nanoscale Physics · Physics 2020-04-16 Yan-Ting Liu , Tian-Yue Chen , Tzu-Hsiang Lo , Tsung-Yu Tsai , Shan-Yi Yang , Yao-Jen Chang , Jeng-Hua Wei , Chi-Feng Pai

It has been reported in experiments that capping layers which enhance the perpendicular magnetic anisotropy (PMA) of magnetic tunnel junctions (MTJs) induce great impact on the tunnel magnetoresistance (TMR). To explore the essential…

Computational Physics · Physics 2017-01-02 Jiaqi Zhou , Weisheng Zhao , Yin Wang , Shouzhong Peng , Junfeng Qiao , Li Su , Lang Zeng , Na Lei , Lei Liu , Youguang Zhang , Arnaud Bournel

We theoretically analyze the spectrum of a magnetic molecule when its charge and spin can couple to the molecular vibrations. More specifically, we show that the interplay between charge-vibron and spin-vibron coupling leads to a…

Mesoscale and Nanoscale Physics · Physics 2018-07-04 Ahmed Kenawy , Janine Splettstoesser , Maciej Misiorny