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The exchange interaction between electrons and magnetic spins is considerably enhanced near interfaces, in magnetic multilayers. As a result, a dc current can be used to generate spin oscillations. We review theory and experimental…

Mesoscale and Nanoscale Physics · Physics 2009-11-07 L. Berger

Magnetic neutron scattering measures spin-spin correlations giving information about the long-range spin order as well as the shape of the spin density in magnetic materials. Similarly, detailed first principles calculations directly…

A procedure is outlined for the determination of magnetic exchange constants in anisotropic perovskite anitferromagnets using powder inelastic neutron scattering. Spin wave densities-of-states are measured using time-of-flight inelastic…

Strongly Correlated Electrons · Physics 2009-11-13 R. J. McQueeney , J. -Q. Yan , S. Chang , J. Ma

We present an experimental study of macroscopic and microscopic magnetic anisotropy of a spin tetramer system \cso using torque magnetometry and ESR spectroscopy. Large rotation of macroscopic magnetic axes with temperature observed from…

Strongly Correlated Electrons · Physics 2016-08-08 Mirta Herak , Dijana Žilić , Dubravka Matković Čalogović , Helmuth Berger

We study theoretically the influence of the temperature and disorder on the spin wave spectrum of the magnonic crystal Fe$_{1-c}$Co$_{c}$. Our formalism is based on the analysis of a Heisenberg Hamiltonian by means of the wave vector and…

Materials Science · Physics 2023-01-06 Sebastian Paischer , Paweł A. Buczek , Nadine Buczek , David Eilmsteiner , Arthur Ernst

Quantum mechanical calculations based on an extended Heisenberg model are compared with ferromagnetic resonance (FMR) experiments on prototype trilayer systems Ni_7/Cu_n/Co_2/Cu(001) in order to determine and separate for the first time…

Strongly Correlated Electrons · Physics 2009-11-11 S. Schwieger , J. Kienert , K. Lenz , J. Lindner , K. Baberschke , W. Nolting

The magnetic properties and phase diagrams of the mixed spin-1 and spin-1/2 Ising model on a checkerboard square structure have been studied using the Monte Carlo simulations based on the Metropolis update protocol. The system consists of…

Statistical Mechanics · Physics 2021-09-15 Maen Gharaibeh , Mohammad H. A. Badarneh , Samah Alqaiem , Abdalla Obeidat , Mohammad-Khair Qaseer

The discovery of ferromagnetism in Mn doped GaAs [1] has ignited interest in the development of semiconductor technologies based on electron spin and has led to several proof-of-concept spintronic devices [2-4]. A major hurdle for realistic…

Materials Science · Physics 2009-11-11 Dale Kitchen , Anthony Richardella , Jian-Ming Tang , Michael E. Flatte , Ali Yazdani

We use inelastic neutron scattering to study the temperature dependence of the spin excitations of a detwinned superconducting YBa$_2$Cu$_3$O$_{6.45}$ ($T_c=48$ K). In contrast to earlier work on YBa$_2$Cu$_3$O$_{6.5}$ ($T_c=58$ K), where…

Superconductivity · Physics 2009-11-13 Shiliang Li , Zahra Yamani , Hye Jung Kang , Kouji Segawa , Yoichi Ando , Xin Yao , H. A. Mook , Pengcheng Dai

Inelastic neutron scattering (INS) is a key method for studying magnetic excitations in spin systems, including molecular spin clusters. The method has significantly advanced in recent years and now permits to probe the scattering intensity…

Strongly Correlated Electrons · Physics 2021-07-30 Shadan Ghassemi Tabrizi

Angular scattering in charge exchange and elastic collisions between interstellar ions and neutral (ISN) atoms has been assumed to be negligible in previous studies. Here, we investigated the momentum transfer associated with the angular…

We report the magnetic excitation spectrum as measured by inelastic neutron scattering for a polycrystalline sample of Sr$_3$CuPtO$_6$. Modeling the data by the 2+4 spinon contributions to the dynamical susceptibility within the chains, and…

We investigated the nature of the magnetic phase transition in the Ge/1-x-y/Sn/x/Mn/y/Te mixed crystals with chemical composition changing in the range of 0.083 < x < 0.142 and 0.012 < y < 0.119. The DC magnetization measurements performed…

Materials Science · Physics 2012-03-15 L. Kilanski , R. Szymczak , W. Dobrowolski , K. Szałowski , V. E. Slynko , E. I. Slynko

Various types of mixed spin two-dimensional Heisenberg networks are investigated by means of Monte Carlo simulations. This study aims at interpreting quantitatively the thermodynamical properties of two-dimensional molecule-based magnets…

Statistical Mechanics · Physics 2009-10-30 B. Mombelli , O. Kahn , J. Leandri , Y. Leroyer , S. Mechkov , Y. Meurdesoif

The low temperature properties of fermionic solids are governed by spin exchanges. Near the melting transition, the spin-exchange energy increases as well as the relative contribution of large loops. In this paper, we check the convergence…

Strongly Correlated Electrons · Physics 2011-06-16 B. Bernu , D. M. Ceperley

We study indirect exchange interactions between localized spins of magnetic impurities in spin-valley coupled systems described with the Kane-Mele model. Our model captures the main ingredients of the energy bands of 1H transition metal…

Mesoscale and Nanoscale Physics · Physics 2022-12-13 M. R. Losada , A. T. Costa , B. Biel , J. Fernández-Rossier

We experimentally report a hitherto unseen angular anisotropy in the polarized small-angle neutron scattering (SANS) cross section of a magnetically strongly inhomogeneous material. Based on an analytical prediction using micromagnetic…

$^{75}$As NMR measurements were performed on a polycrystalline sample of spin-1/2 alternating-spin-chain Heisenberg antiferromagnet AgVOAsO$_4$. Temperature-dependent NMR shift $K(T)$, which is a direct measure of the intrinsic spin…

Materials Science · Physics 2017-12-27 N. Ahmed , P. Khuntia , H. Rosner , M. Baenitz , A. A. Tsirlin , R. Nath

A comprehensive theoretical and experimental study is presented of the magnetic susceptibility versus temperature \chi(T) of spin S = 1/2 two- and three-leg Heisenberg ladders and ladder oxide compounds. Extensive quantum Monte Carlo…

Monte Carlo simulation has been employed to investigate the magnetic properties and phase diagrams of ferrimagnetic mixed-spin (1/2, 1) triangular Ising nanotube with core-shell structure. In particular, the effect of the exchange couplings…

Mesoscale and Nanoscale Physics · Physics 2021-10-04 Maen Gharaibeh , Samah Alqaiem , Abdalla Obeidat , Ahmad Al-Qawasmeh , Sufian Abedrabbo , Mohammad Badarneh
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