We report a method of imaging the magnetization reversal process using analysis real-time images magnetic domain structures in cylindrically shaped microwires. This uses wide-field polarizing optical microscopy and is based on magneto-optical Kerr effect (MOKE). The aperture diaphragm MOKE microscope was used to control incident angles light rays that reached non-planar surface microwire also determined geometries. movement non-central position hole this leads change orientation plane...

Complementary multiscale magneto-optical studies based on the polar Kerr effect are carried out an ultrathin cobalt wedge covered with a silver and subsequently Au thick layer. A few monolayers of Ag found to have substantial magnetic anisotropy, coercivity field, rotation. The overlayer thickness-driven reorientation from easy axis plane generates new type 90 degrees wall for thicknesses between 1.3 1.8 nm. tuning width in wide range is possible. Tailoring structure can be used film patterning.

Regularly arranged magnetic out-of-plane patterns in continuous and flat films are promising for applications data storage technology (bit patterned media) or transport of individual particles. Whereas topographic structures fabricated by standard lithographical techniques, the fabrication regularly artificial domains topographically is difficult, since free energy minimization determines existence, shape, regularity domains. Here we show that keV He + ion bombardment Au/Co/Au layer systems...

The results of combined (experimental, analytical, and micromagnetic simulations) studies on the evolution magnetization states processes in ultrathin films multilayered systems are presented. We show ways to manipulate distributions magnetic single or multilayers by tuning: thickness layer, either non‐magnetic cap spacer anisotropy, geometrical constrictions system. In films, both distribution critical reorientation phase transition (RPT) between perpendicular in‐plane can be also...

The giant magnetoresistance (GMR), magnetization reversal, and domain structure of magnetron sputtered spin valve [NiFe/Au/Co/Au]N multilayers consisting ferromagnetic layers with alternating in-plane (NiFe) out-of-plane (Co) magnetic anisotropy has been investigated. For 0.4<tCo<1.2 nm GMR dependencies characterized by a linear almost nonhysteretic dependence resistance on the field were found. Within hysteretic range reversal Co layers, for N>3, neighboring observed to...

An elegant route for tuning the magnetic anisotropy of ultrathin Co films by Ga+ ion irradiation is presented. The a Pt/Co(2.6 nm)/Pt film first changed from in-plane to out-of-plane uniform low dose at 30 keV. When increasing dose, second spin reorientation transition toward sample plane also evidenced. This could be way design nanowires with perpendicular anisotropy, embedded in an magnetized environment, either through mask or focused beam. Tentative explanations on origin these two...

Defined perpendicular anisotropy gradients in the Co sublayers of a [Co(0.6 nm)/Au(2 nm)](3) sputter-deposited multilayer have been introduced by light ion bombardment through wedged Au stopper layer. Within such layer system, domain walls between up- and down-magnetized areas are controllably movable an external homogeneous magnetic field. This method system is very promising for controlled particle transport within stray fields moving walls.

Magnonic crystals (metamaterials to control magnetism) are attractive for manipulating spin waves in digital logic and storage applications, but the end one needs be able actually produce them---an interesting challenge nanotechnology. This work shows how interlayer coupling magnetization strength can engineered Co/Mo/Co ultrathin-film structures by ion irradiation. Modifications of magnetic properties correlated explained structural evolution, as revealed numerical simulations. The authors...

Annealing ultrathin Pt/Co/Pt films with single femtosecond laser pulses leads to irreversible spin-reorientation transitions and an amplification of the magneto-optical Kerr rotation. The effect was studied as a function Co thickness pulse fluence, revealing two-dimensional diagrams magnetic properties. While increasing creation two branches out-of-plane magnetization state found.

We report on the nucleation of circular domains in outer shell magnetic, Co-rich, amorphous microwires over a wide range magnetic field pulse frequencies and amplitudes. Nucleation low barrier regime different numbers single was detected using magneto-optical Kerr effect. The amplitude frequency dependence domain probability is described framework model which agrees well with experimental data. have shown that to efficiently drive alternating electric current excitation, precise tuning necessary.

Magnetic properties of an ultrathin Co layer deposited on the Mo(1 1 0) or Au(1 1) buffers crucially depend magnetic thickness and a cap type (Au Mo, studied in this work). Depending sandwich configuration, magnetization is oriented perpendicular direction to plane range smaller (below 2 nm) sample for thicker (3 nm). Moreover, well-developed two-fold in-plane anisotropy occurs Mo buffer. These features are correlated with crystalline structure use numerous complementary methods: reflection...

The spatial distribution of magnetic properties studied by polar Kerr-effect-based magnetometry are carried out on an ultrathin cobalt wedge covered with a silver whose slopes perpendicular to each other and subsequently capped gold layer. coercivity field was as function both thickness d h. A few monolayers Ag were found have substantial influence the field. similar strong coverage anisotropy observed. Domain structure evolution during magnetization reversal is investigated using optical...

(Co/Au)N ultrathin multilayers with perpendicular and in-plane magnetic anisotropy were studied experimentally using a combination of ferromagnetic resonance, magneto-optical magnetometry microscopy (with both out-of-plane magnetization-sensitive longitudinal polar Kerr effects), force (MFM). Three-dimensional magnetization distributions reconstructed from micromagnetic simulations complemented by the measured parameters observations MFM. It is shown that, in reorientation phase transition...

Ultrathin Pt/Co/Pt trilayers with initial in-plane magnetization were irradiated femtosecond laser pulses. In this way, an irreversible structural modification was introduced, which resulted in the creation of numerous pulse fluence-dependent magnetic phases. This particularly true out-of-plane state, exhibited a submicrometer domain structure. effect studied broad range fluences up to point ablation metallic films. addition single-pulse experiment, multiple exposure spots also investigated,...

Molecular beam epitaxy-grown layered structures Co/Mo/Co exhibit an antiparallel coupling of Co films magnetization in the Mo spacer thickness range between 0.5 nm and 1.0 parallel beyond this range. Magnetic properties are substantially modified by irradiation 35 keV Ga+ ions. With increase ion fluence, switches to one. Further fluence results gradual suppression ferromagnetic behavior system. Experimental correlated with numerical simulations structure evolution driven irradiation.

The influence of He + (10 keV) ion bombardment on magnetic properties sputter deposited Ni 80 Fe 20 /Au/Co/Au layered films was studied.The variable parameters were the thickness Co layer or Au spacer and dose.The magnetooptical Kerr measurements performed samples with wedge shaped layers.With increasing dose helium ions following changes in observed: (i) a decrease range corresponding to perpendicular anisotropy, (ii) coercive field (H C ), (iii) an increase ferromagnetic coupling between layers.

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The influence of the Co layer thickness as well number repetitions <emphasis emphasistype="italic">N</emphasis> on magnetic properties (Co/Au)<formula formulatype="inline"><tex Notation="TeX">$_{\rm N}$</tex></formula> multilayers was investigated systematically using magneto-optical techniques, vibrating sample magnetometry, and force microscopy. studies focused characteristics hysteresis loops...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Material selective sensitivity of a magneto-optical polar Kerr effect to magnetizations films from different materials in multilayer system is presented. The method supported by rigorous modeling magneto-optic response the and experimental demonstration on periodic cobalt-permalloy multilayers [Ni<formula formulatype="inline"><tex Notation="TeX">$_{80}$</tex></formula>Fe<formula...

Magnetic multilayers of (Ir/Co/Pt)6 with interfacial Dzyaloshinskii-Moriya interaction (IDMI) were deposited by magnetron sputtering Co thickness d=1.8 nm. Exploiting magneto-optical Kerr effect in longitudinal mode microscopy, magnetic force and vibrating sample magnetometry, the field-driven evolution domain structures magnetization hysteresis loops have been studied. The existence weak stripe domains structure was deduced – tens micrometers size in-plane “core” modulated hundred...

Multilayers of (F/NF)N composition, where F means a ferromagnetic layer, NF nonferromagnetic one, and N the number repetitions, are studied by simulations theoretically for different magnetic anisotropy characterized quality factor, Q (the ratio energy to be gained magnetization along easy axis perpendicular sample surface magnetostatic uniformly magnetized layer normal). It is shown that range existence out-of-plane states could extended Q&amp;lt;1 proper choice layers thicknesses. The role...

An irreversible rotation of magnetization from in-plane to an out-of-plane direction was induced in Pt/Co/Pt epitaxial trilayers by single and multiple pulses extreme ultraviolet (EUV) irradiations. The radial dependence remanence, coercivity saturation fields across the irradiated spots studied with help magneto-optical techniques for samples various Co Pt buffer layer thicknesses. sample surface magnetic ordering were investigated using atomic force microscopies. Based on morphological...