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We studied the dynamic magnetic properties of plane periodical arrays of circular permalloy nano-dots fabricated using a self-organized mask formed by polysterene nanospheres on the surface of a Permalloy film. Conventional (microwave…

Materials Science · Physics 2008-02-07 M. Kostylev , R. Magaraggia , F. Y. Ogrin , V. Mescheryakov , N. Ross , R. L. Stamps

We present room temperature ferromagnetic resonance (FMR) studies of polycrystalline ||Pt/10 nm Cu/t Co/10 nm Cu/Pt|| films as a function of Co layer thickness (1 < t < 10 nm) grown by evaporation and magnetron sputtering. FMR was studied…

Materials Science · Physics 2007-07-10 J-M. L. Beaujour , W. Chen , A. D. Kent , J. Z. Sun

In this study, the magnetic reversal process of exchange-coupled bilayer systems, consisting of a ferrimagnetic TbFeCo alloy layer and a ferromagnetic [Co/Ni/Pt]N multilayer, was investigated. In particular, minor loop studies, probing…

The first observation of microwave magnetoelectric (ME) interactions through ferromagnetic resonance (FMR) in bilayers of single crystal ferromagnetic-piezoelectric oxides and a theoretical model for the effect are presented. An electric…

Materials Science · Physics 2009-11-10 S. Shastry , G. Srinivasan , M. I. Bichurin , V. M. Petrov , A. S. Tatarenko

We present a numerical study of the spin-1/2 bilayer Heisenberg antiferromagnet with random interlayer dimer dilution. From the temperature dependence of the uniform susceptibility and a scaling analysis of the spin correlation length we…

Disordered Systems and Neural Networks · Physics 2009-11-07 O. P. Vajk , M. Greven

The spin structure of exchange-coupled MnBi:Co-Fe bilayers is investigated by X-ray magnetic circular dichroism (XMCD), polarized neutron reflectometry (PNR), and micromagnetic simu-lations. The purpose of the present research is two-fold.…

We explored changes in magnetic domain structures in a magnetic layer due to the onset of the superconductivity of an adjacent superconductive layer using neutron reflectometry. Magnetic domain structures in 1~$\mu$m thick permalloy (Py)…

Mesoscale and Nanoscale Physics · Physics 2014-10-22 Yaohua Liu , M. Iavarone , A. Belkin , G. Karapetrov , V. Novosad , M. Zhernenkov , Q. Wang , M. R. Fitzsimmons , V. Lauter , S. G. E. te Velthuis

Temperature-dependent magnetic experiments like pump-probe measurements generated by a pulsed laser have become a crucial technique for switching the magnetization in the picosecond time scale. Apart from having practical implications on…

We use time-resolved (TR) measurements based on the polar magneto-optical Kerr effect (MOKE) to study the magnetization dynamics excited by spin orbit torques in Py (Permalloy)/Pt and Ta/CoFeB bilayers. The analysis reveals that the…

Materials Science · Physics 2020-04-22 Xinran Zhou , Hang Chen , Yu-Sheng Ou , Tao Wang , Rasoul Barri , Harsha Kannan , John Q. Xiao , Matthew F. Doty

Using a multilayer structure containing (cobalt detector layer)/(copper spacer)/(Permalloy source layer), we show experimentally how the non-reorientable spin-orbit torque generated by the Permalloy source layer (the component of spin-orbit…

Mesoscale and Nanoscale Physics · Physics 2021-08-25 Joseph A. Mittelstaedt , Daniel C. Ralph

Frequency dependence of magnetoelectric (ME) coupling is investigated in trilayers of ferromagnetic alloy and piezoelectric lead zirconate titanate (PZT). The ferromagnetic phases studied include permendur, a soft magnet with high…

Materials Science · Physics 2007-05-23 U. Laletsin , N. Paddubnaya , G. Srinivasan , M. I. Bichurin

The complex nature of the magnetic ground state in La$_{1-x}$A$_{x}$CoO$_{3}$ (A = Ca, Sr, Ba) has been investigated via neutron scattering. It was previously observed that ferromagnetic (FM) as well as antiferromagnetic (AFM) correlations…

Strongly Correlated Electrons · Physics 2015-05-18 Peng Tong , Juan Yu , Qingzhen Huang , Kazuyoshi Yamada , Despina Louca

We experimentally observe nonlinear spin torque in metallic bilayers of platinum and permalloy by means of spin-torque ferromagnetic-resonance (ST-FMR) under massive dc current injection. The observed nonlinear spin torque exerted to…

Mesoscale and Nanoscale Physics · Physics 2024-06-18 Toshiyuki Kodama , Nobuaki Kikuchi , Takahiro Chiba , Satoshi Okamoto , Seigo Ohno , Satoshi Tomita

The dynamic behavior and stabilization of skyrmions in magnetic multilayers are critical for advancing spintronic and magnonic technologies. In our study, we investigate the static and dynamic properties of $[Re/Co(d_{Co})/Pt]_{20}$…

The depth profile of the intrinsic magnetic properties in an Fe/Sm-Co bilayer fabricated under nearly optimal spring-magnet conditions was determined by complementary studies of polarized neutron reflectometry and micromagnetic simulations.…

Materials Science · Physics 2014-11-21 Yaohua Liu , S. G. E. te Velthuis , J. S. Jiang , Y. Choi , S. D. Bader , A. A. Parizzi , H. Ambaye , V. Lauter

The magnets are typically classified into Stoner and Heisenberg type, depending on the itinerant or localized nature of the constituent magnetic moments. In this work, we investigate theoretically the behaviour of the magnetic moments of…

Using first-principles calculations, we study the magnetic properties of a Co monolayer on a Pt(111) surface with a capping monolayer of selected $5d$ elements (Re, Os, Ir, Pt and Au). First we determine the tensorial exchange interactions…

Materials Science · Physics 2018-04-18 E. Simon , L. Rózsa , K. Palotás , L. Szunyogh

In this study we have compared magnetic, magnetostrictive and piezomagnetic properties of isotropic and anisotropic cobalt ferrite pellets. The isotropic sample was prepared by the ceramic method while the sample exhibiting uniaxial…

Materials Science · Physics 2018-03-28 Alex Aubert , Vincent Loyau , Frédéric Mazaleyrat , Martino Lobue

We report results of density-functional theory calculations on the structural, magnetic, and electronic properties of (1x1)-structures of Co on Cu(001) for coverages up to two monolayers. In particular we discuss the tendency towards phase…

Materials Science · Physics 2009-10-31 R. Pentcheva , M. Scheffler

The use of advanced X-ray sources plays a key role in the study of dynamic processes in magnetically ordered materials. The progress in X-ray free electron lasers enables the direct and simultaneous observation of the femtosecond evolution…