Magneto-optical indicator film study of the magnetization of a symmetric spin valve
نویسنده
چکیده
L.H. Bennett, P.J. Chen, R.D. McMichael, M.J. Donahue, L.J. Swartzendruber, A.J. Shapiro, H.J. Brown, W.F. Egelhoff, Jr. National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA Abstract A magneto-optical indicator film (MOIF) technique is used for direct experimental study of the magnetization reversal process in a symmetric NiO/Co/Cu/NiFe/Cu/Co/NiO spin valve. It is shown for the first time that the reversal of the free center layer proceeds by nonuniform magnetization rotation. The observed switching mechanism is presumed to be associated with the influence of the nonuniform magnetostatic field that follows from surface roughness and the polycrystalline structure of the magnetic layers.
منابع مشابه
Spin Reorientation Transitions and Domain Structure in Magnetic Multilayers
Spin reorientation phase transitions and the evolution of the magnetic phases states arising during magnetization reversal of antiferromagnetic CoNiCu/Cu superlattice are studied using magneto-optical indicator film technique, accompanied by vector hysteresis loop measurements. The spinflop and nonsymmetric angle phases have been found and analyzed. It is shown that they arise due to the nuclea...
متن کاملCOMPLEMENTARY IMAGING OF GRANULAR Co-Ag FILMS WITH MAGNETO-OPTICAL INDICATOR FILM TECHNIQUE AND MAGNETIC FORCE MICROSCOPY
A Magneto-optical indicator film (MOIF) technique and magnetic force microscopy were used for visualization and direct real-time experimental study of the magnetization processes of magnetic Co90Ag10 granular films. It is shown that the magnetization reversal of the as-deposited films follows a specific two-step course. The first stage is characterized by gradual spin rotation to large angles u...
متن کاملHuge quadratic magneto-optical Kerr effect and magnetization reversal in the Co2FeSi Heusler compound
Co2FeSi(100) films with L21 structure deposited onto MgO(100) were studied exploiting both longitudinal (LMOKE) and quadratic (QMOKE) magneto-optical Kerr effect. The films exhibit a huge QMOKE signal with a maximum contribution of up to 30mdeg, which is the largest QMOKE signal in reflection that has been measured thus far. This large value is a fingerprint of an exceptionally large spin-orbit...
متن کاملFemtosecond spectrotemporal magneto-optics.
A new method to measure and analyze the time and spectrally resolved polarimetric response of magnetic materials is presented. It allows us to study the ultrafast magnetization dynamics of a CoPt3 ferromagnetic film. The analysis of the pump-induced rotation and ellipticity detected by a broad spectrum probe beam shows that magneto-optical signals predominantly reflect the spin dynamics in ferr...
متن کاملMagneto-optical Kerr effect in laser-patterned La2Õ3Sr1Õ3MnO3 epitaxial thin films
In this study, we have performed magneto-optical Kerr effect ~MOKE! measurement on epitaxial La2/3Sr1/3MnO3 thin films containing artificial interfaces created by laser-patterning the SrTiO3 substrate. The observed increase of the resistivity and of the high-field magnetoresistance when measuring the films across the interface arrays are related to the reduction of the magnetization of the inte...
متن کامل