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Dephasing-Assisted Macrospin Transport

Stefano Iubini, Simone Borlenghi, Anna Delin, Stefano Lepri, Francesco Piazza
2020 Entropy  
In the present work, we show, by means of micromagnetics simulations, that transport efficiency in a chain of classical macrospins can be greatly increased by an optimal level of dephasing noise.  ...  There are, however, cases in which transport can be enhanced by fluctuations.  ...  On the other hand, the generality of the DNLS model strongly suggests that dephasing-assisted transport is a general phenomenon that can be observed in a large class of classical oscillating systems.  ... 
doi:10.3390/e22020210 pmid:33285985 fatcat:6e5ciadw5vew3nfstwam2e44ha

Magnetization Dynamics [article]

Andrew D. Kent, Hendrik Ohldag, Herrmann Dürr, Jonathan Z. Sun
2018 arXiv   pre-print
In the sub-threshold I < I c0 region, while no switching would be expected at zero temperature, with finite temperature, thermally-assisted reversal has a finite probability.  ...  The dephasing of the spin component transverse to the magnetization under the usually strong s-d exchange-like interaction results in a net torque being exerted on the ferromagnetic moment.  ... 
arXiv:1810.04591v1 fatcat:eze62gbswzcqpkm4hbgvrfmhca

Maximizing Spin-Orbit Torque Generated by the Spin Hall Effect of Pt [article]

Lijun Zhu, Daniel C. Ralph, Robert A Buhrman
2021 arXiv   pre-print
Here we reviews recent advances in understanding the physics of spin current generation, interfacial spin transport, and the metrology of spin-orbit torques, and summarize progress towards the goal of  ...  are thinner than its spin dephasing length (~1 nm for 3d FMs 104 ).  ...  layer (interpreted in some literature as "to break the reversal symmetry" of a macrospin).  ... 
arXiv:2106.04992v2 fatcat:fh3zmdapc5dj3k7tu6ichscqr4

Ensemble-averaged Rabi oscillations in a ferromagnetic CoFeB film

Amir Capua, Charles Rettner, See-Hun Yang, Timothy Phung, Stuart S. P. Parkin
2017 Nature Communications  
Our study is a step towards connecting concepts used in quantum processing with spin-transport effects in ferromagnets.  ...  Acknowledgements We thank Dr Dan Rugar, Dr Chris Lutz and Dr John Mamin for fruitful discussions, and Chris Lada for expert technical assistance.  ...  Furthermore, it is worth noting that although our macrospin model lacks spatial resolution, it reproduces the experimental results.  ... 
doi:10.1038/ncomms16004 pmid:28656960 pmcid:PMC5493749 fatcat:tfc7khitejba5kyuf4lrwgi6fm

Inductive determination of the optimum tunnel barrier thickness in magnetic tunneling junction stacks for spin torque memory applications

S. Serrano-Guisan, W. Skowronski, J. Wrona, N. Liebing, M. Czapkiewicz, T. Stobiecki, G. Reiss, H. W. Schumacher
2011 Journal of Applied Physics  
Such inductive measurements, in combination with wafer probe station based magneto transport experiments, allow a fast determination of the optimum tunnel barrier thickness range for spin torque memory  ...  However, a further systematic study of this impurity-assisted IEC in the sputtered CoFeB/MgO/CoFeB MTJs under a precise control of the parameter conditions during the growth process of the samples should  ...  As the way the magnetization relaxes towards equilibrium is very sensitive to the details of the microscopic interactions 32 , this large magnetic inhomogeneity will lead to an inhomogeneous dephasing  ... 
doi:10.1063/1.3610948 fatcat:mcmzdw4jxjht7fj33gh55bkzci

Spin caloritronics

Gerrit E. W. Bauer, Eiji Saitoh, Bart J. van Wees
2012 Nature Materials  
This work was supported in part by the FOM Foundation, EU-ICT-7 'MACALO' , and DFG Priority Programme 1538 'Spin-Caloric Transport' .  ...  The spin-related signal can be disentangled by the Hanle effect -that is, the dephasing of the spin accumulation by a transverse magnetic field.  ...  If the underlying ferromagnet is macroscopically large, a macrospin approximation is not appropriate.  ... 
doi:10.1038/nmat3301 pmid:22522639 fatcat:3oftek665jaf5mq76vmfwbdvhm

Information transfer in coupled Langevin equations [article]

Simone Borlenghi
2020 arXiv   pre-print
More exotic situations such as discrete breathers and negative temperature states [32] , dephasing-assisted spin transport [33] and anomalous heat transport in oscillator chains [34] involve information  ...  We remark that in spin systems the latter corresponds to the spin wave current that describes the net transport of the magnetisation between neighbouring macrospins [22] and as with Φ C , it is a coherent  ... 
arXiv:2004.03950v1 fatcat:uzgbxn7cqrbmlmuizdybpcxs6e

Charge pumping by magnetization dynamics in magnetic and semimagnetic tunnel junctions with interfacial Rashba or bulk extrinsic spin-orbit coupling

Farzad Mahfouzi, Jaroslav Fabian, Naoto Nagaosa, Branislav K. Nikolić
2012 Physical Review B  
requires to take into account up to ten photons in order to reach the asymptotic value of pumped charge current; (iv) disorder within F/I/F MTJs can enhance the dc pumping voltage in the quasiballistic transport  ...  TAMR and spin dephasing in perpendicular transport through interfaces with the Rashba SOC To understand the correspondence between the strength of the Rashba SOC measured by the spindependent hopping parameter  ...  Recent vigorous experimental efforts have focused on the direct detection of pure spin current generated by coherent macrospin precession in both ferromagnetic metals [11] [12] [13] and insulators 14  ... 
doi:10.1103/physrevb.85.054406 fatcat:6mypccbxbngftjgtgo6dqyum6e

Current Induced Magnetization Dynamics in Electrodeposited Nanostructures

Elena Murè
This apparent dephasing linked to the inversion of the field is not explained by our simple macrospin model, which presumes a "pure" STT excitation of the resonances.  ...  Spin dependent transport in ferromagnets We adopt here a semiclassical description of transport phenomena in ferromagnetic materials.  ... 
doi:10.5075/epfl-thesis-4687 fatcat:euyhvmixxrbptoihpggcwecl3m

Magnetic Nanoparticles: A Subject for Both Fundamental Research and Applications

S. Bedanta, A. Barman, W. Kleemann, O. Petracic, T. Seki
2013 Journal of Nanomaterials  
[35] reported the transport measurement performed in selfassembled Co particles.  ...  The direction of the superspin or macrospin fluctuates with a frequency or a characteristic relaxation time, = (2 ) −1 .  ... 
doi:10.1155/2013/952540 fatcat:duyhyjcy4rfrzj5hhb2eyemplm

From Spin Torque Nano-Oscillators to Memristors: Multi-Functional Nanodevices for Advanced Computing [article]

Julie Grollier
2014 arXiv   pre-print
We have performed macrospin simulations taking into account the wavy dependence of spin transfer torque.  ...  Thanks to macrospin simulations we have shown the possibility to synchronize several oscillators by this method.  ... 
arXiv:1407.1494v1 fatcat:3s7qby2ysngifjlxcl55su6nda

Towards high-density low-power spin-transfer-torque random access memory [article]

Urmimala Roy
Moreover, the traditionally used magnetic-eld-assisted random access memory (MRAM) is not scalable to smaller bits.  ...  Results Fokker-Planck calculation of WER within the macrospin approximation Here, we rst look at WER for a range of device dimensions within the macrospin approximation.  ... 
doi:10.15781/t24k9k fatcat:lzyxqrpi6vfmnfcrddhgnpxs2i

Interface-Induced Phenomena in Magnetism [article]

Frances Hellman, Axel Hoffmann, Yaroslav Tserkovnyak, Geoffrey Beach, Eric Fullerton, Chris Leighton, Allan MacDonald, Dan Ralph, Dario Arena, Hermann Durr, Peter Fischer, Julie Grollier, Joseph Heremans, Tomas Jungwirth (+12 others)
2017 arXiv   pre-print
It starts with an introduction and overview of how basic magnetic properties are affected by interfaces, then turns to a discussion of charge and spin transport through and near interfaces and how these  ...  , and Suzanne Kokosz at Argonne National Lab for her editing assistance.  ...  One approach is the macrospin approximation, in which the magnetization is assumed to be spatially uniform.  ... 
arXiv:1607.00439v3 fatcat:v6w2ojb67je4jbg22hwdzzfrti

2019 Subject Index (N-Z) IEEE Transactions on Magnetics Vol. 55

2019 IEEE transactions on magnetics  
., +, TMAG Aug. 2019 1500309 Compact Macrospin-Based Model of Three-Terminal Spin-Hall Nano Oscillators.  ...  Taniguchi, T., TMAG Feb. 2019 1400204 Effects of Elastic Dephasing on Scaling of Ultra-Small Magnetic Tunnel Junctions.  ... 
doi:10.1109/tmag.2020.2971166 fatcat:t37e2rcg2zez3oahabpj23ftaa

Antiferromagnetic spintronics

V. Baltz, A. Manchon, M. Tsoi, T. Moriyama, T. Ono, Y. Tserkovnyak
2018 Reviews of Modern Physics  
Intense research efforts over the past decade have been invested in unraveling spin transport properties in antiferromagnetic materials.  ...  Whether spin transport can be used to drive the antiferromagnetic order and how subsequent variations can be detected are some of the thrilling challenges currently being addressed.  ...  Other attempts reported efficient spin Hall assisted magnetic order reversal in FeMn and IrMn alloys Yang et al., 2016) .  ... 
doi:10.1103/revmodphys.90.015005 fatcat:evuoiwdjifctpl275k2lutlv4y
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