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We address the electronically induced anisotropy field acting on a spin moment comprised in a vibrating magnetic molecule located in the junction between ferromagnetic metals. Under weak coupling between the electrons and molecular…

Mesoscale and Nanoscale Physics · Physics 2018-06-20 J. D. Vasquez Jaramillo , H. Hammar , J. Fransson

The ordered L1$_0$ FeNi phase (tetrataenite) is recently considered as a promising candidate for the rare-earth free permanent magnets applications. In this work we calculate several characteristics of the L1$_0$ FeNi, where most of the…

Materials Science · Physics 2017-11-27 Mirosław Werwiński , Wojciech Marciniak

In our JunPy package, we have combined the first-principles calculated self-consistent Hamiltonian with divide-and-conquer technique to successfully determine the magnetic anisotropy (MA) in an Fe/MgO/Fe magnetic tunnel junction (MTJ). We…

Materials Science · Physics 2023-08-21 Bao-Huei Huang , Yu-Hsiang Fu , Chao-Cheng Kaun , Yu-Hui Tang

Magnetic anisotropies and magnetization reversal properties of the epitaxial Heusler compound Co$_2$Cr$_{0.6}$Fe$_{0.4}$Al (CCFA) deposited on Fe and Cr buffer layers are studied. Both samples exhibit a growth-induced fourfold anisotropy,…

Materials Science · Physics 2009-11-11 J. Hamrle , S. Blomeier , O. Gaier , B. Hillebrands , R. Schafer , M. Jourdan

A spin-orbital chain with different Land\'e $g$ factors and one-ion anisotropy is studied in the context of the thermodynamical Bethe ansatz. It is found that there exists a magnetization plateau resulting from the different Land\'e $g$…

Strongly Correlated Electrons · Physics 2009-11-10 Zu-Jian Ying , Angela Foerster , Xi-Wen Guan , Bin Chen , Itzhak Roditi

We report measurements on magnetization reversal in the Fe$_8$ molecular magnet using fast pulsed magnetic fields of 1.5 kT/s and in the temperature range of 0.6-4.1 K. We observe and analyze the temperature dependence of the reversal…

Mesoscale and Nanoscale Physics · Physics 2014-09-11 S. N. Jammalamadaka , J. Vanacken , V. V. Moshchalkov , Saül Vélez , J. Tejada , Ferran Macià

Antiferromagnets (AFMs) are widely believed to be superior than ferromagnets in spintronics because of their high stability due to the vanishingly small stray field. It is thus expected that the order parameter of AFM should always align…

Mesoscale and Nanoscale Physics · Physics 2020-04-27 H. Y. Yuan , Man-Hong Yung , X. R. Wang

Understanding the transport behavior of an electronic system under the influence of a magnetic field remains a key subject in condensed matter physics. Particularly in topological materials, their nonvanishing Berry curvature can lead to…

Mesoscale and Nanoscale Physics · Physics 2023-03-24 Jeonghyeon Suh , Sanghyun Park , Hongki Min

From density-functional-theory (DFT) based methods we calculate the vibrational spectrum of the Mn_{12}O_{12}(COOH)_{16}(H_2 O)_4 molecular magnet. Calculated infrared intensities are in accord with experimental studies. There have been no…

Materials Science · Physics 2009-11-07 Mark R. Pederson , Noam Bernstein , Jens Kortus

Recently it has been demonstrated that a careful treatment of both longitudinal and transverse matrix elements in electron energy loss spectra can explain the mystery of relativistic effects on the {\it magic angle}. Here we show that there…

Materials Science · Physics 2009-11-13 A. P. Sorini , J. J. Rehr , Z. H. Levine

Single magnetic atoms or molecules with large single-ion magnetic anisotropy are highly desired for future applications in high-density data storage and quantum computation. Here we have synthesized an Fe-porphyrin complex on Au(111)…

Mesoscale and Nanoscale Physics · Physics 2017-07-19 Bing Liu , Huixia Fu , Jiaqi Guan , Bin Shao , Sheng Meng , Jiandong Guo , Weihua Wang

We have investigated analytically quantum tunneling of large spin in the biaxial spin system with the magnetic field applied along the hard and medium anisotropy axes by using a purely quantum-mechanical approach. When the magnetic field…

Mesoscale and Nanoscale Physics · Physics 2009-11-07 Degang Zhang , Bambi Hu

The Berry curvature, resembling the magnetic field in reciprocal space, offers a captivating avenue for exploring unique electromagnetic phenomena devoid of real-space analogs. Here, we investigate the emergent electromagnetic induction by…

Mesoscale and Nanoscale Physics · Physics 2023-12-01 Wei Luo , Wei Chen , D. Y. Xing

We calculate the anisotropy energy of a single-domain ferromagnetic particle in which the only source of anisotropy is the presence of non-magnetic impurities. We find that such anisotropy takes the form of combined easy-axis and easy-plane…

Mesoscale and Nanoscale Physics · Physics 2007-05-23 Piet W. Brouwer , Denis A. Gorokhov

We investigate the magnetic properties of a Heisenberg ferrimagnetic multilayer by using Monte Carlo simulations. The aim of this work is to study the local structural anisotropy model which is a possible origin of the perpendicular…

Materials Science · Physics 2009-11-11 Etienne Talbot , Pierre Emmanuel Berche , Denis Ledue , Renaud Patte

Observation of magnetic domains is important in understanding the magnetic properties of magnetic materials and devices. In this study, we report that the magnetic domains of M-type hexaferrites with uniaxial anisotropy can be visualized…

Mesoscale and Nanoscale Physics · Physics 2020-04-27 Hiroshi Nakajima , Atsuhiro Kotani , Ken Harada , Shigeo Mori

Direction-dependent anisotropic exchange is a common feature of magnetic systems with strong spin-orbit coupling. Here we study the effect of such exchange upon macroscopic magnetic anisotropy for a face-centered-cubic model. By several…

Strongly Correlated Electrons · Physics 2015-07-29 Hiroaki Ishizuka , Leon Balents

We calculate magnetic anisotropy energy of Fe and Ni by taking into account the effects of strong electronic correlations, spin-orbit coupling, and non-collinearity of intra-atomic magnetization. The LDA+U method is used and its equivalence…

Materials Science · Physics 2007-05-23 I. Yang , S. Y. Savrasov , G. Kotliar

A magnetic tunnel junction Fe3O4/MgO/Fe with (001) layer orientation is considered. The junction magnetic energy is analyzed as a function of the angle between the layer magnetization vectors under various magnetic fields. The tunnel…

Materials Science · Physics 2010-12-21 S. G. Chigarev , E. M. Epshtein , I. V. Malikov , G. M. Mikhailov , P. E. Zilberman

We report on the magnetic, thermodynamic, dielectric, and pyroelectric measurements on the hitherto unreported Fe${_4}$Ta${_2}$O${_9}$. This system is seen to exhibit a series of magnetic transitions, many of which are coupled to the…

Strongly Correlated Electrons · Physics 2018-07-18 Soumendra Nath Panja , Luminita Harnagea , Jitender Kumar , P. K. Mukharjee , R. Nath , A. K. Nigam , Sunil Nair