Transient spatio-temporal domain patterns in permalloy microstructures induced by fast magnetic field pulses

Schönhense, G.; Elmers, H. J.; Krasyuk, A.; Wegelin, F.; Nepijko, S. A.; Oelsner, A.; Schneider, Claus M.

doi:10.1016/j.nimb.2005.12.011

Cited by 6 publications

(3 citation statements)

References 31 publications

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“…In ideal defect-free samples such stripe patterns would not be observed, since the domain antiparallel to the external magnetic field would experience no magnetic torque at all. The occurrence of such stripe patterns is attributed to an inhomogeneous magnetization distribution in the equilibrium state or structural imperfections [12]. Similar, but less pronounced stripe patterns are formed in the domain on the right during the trailing edge of the excitation pulse (t = 1.5 − 2 ns).…”

Section: Ni 80 Fe 20 Microstructuresmentioning

confidence: 83%

Influence of magnetocrystalline anisotropy on the magnetization dynamics of magnetic microstructures

Kaiser

Wiemann²,

Cramm³

et al. 2009

J. Phys.: Condens. Matter

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Abstract. The study of magnetodynamics using stroboscopic time-resolved xray photoemission electron microscopy (TR-XPEEM) involves an intrinsic time scale provided by the pulse structure of the synchrotron radiation. In the usual multibunch operation mode, the time span between two subsequent light pulses is too short to allow a relaxation of the system into the ground state before the next pump-probe cycle starts. Using a deflection gating mechanism described in this paper we are able to pick the photoemission signal resulting from selected light pulses. Thus, PEEM measurements can be carried out in a flexible timing scheme with longer delays between two light pulses. Using this technique the magnetodynamics of both Permalloy and Iron structures has been investigated. The differences in the dynamic response on a short magnetic field pulse are discussed with respect to the magnetocrystalline anisotropy.

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Section: Ni 80 Fe 20 Microstructuresmentioning

confidence: 83%

Influence of magnetocrystalline anisotropy on the magnetization dynamics of magnetic microstructures

Kaiser

Wiemann²,

Cramm³

et al. 2009

J. Phys.: Condens. Matter

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“…During each of the 10 8 remagnetization cycles, the magnetization pattern follows practically the same 'path'. In contrast to the fast response in the leading edge of the field pulse (proceeding through propagating precessional remagnetization 16 ), relaxation happens surprisingly slowly. The network of domain walls present in the fine stripe pattern obviously stabilizes this phase, also called blocking pattern.…”

Section: Technical Aspects Of Stroboscopic and Nonstroboscopic Time-rmentioning

confidence: 95%

PEEM with high time resolution—imaging of transient processes and novel concepts of chromatic and spherical aberration correction

Schönhense

Elmers

2006

Surface & Interface Analysis

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The potential of time-resolved photoemission electron microscopy (PEEM) for imaging ultrafast processes and for aberration correction in full-field imaging is discussed. In particular, we focus on stroboscopic imaging of precessional magnetic excitations via XMCD-PEEM exploiting the time structure of synchrotron radiation (magnetic field pulse pump-X-ray probe). In a special bunch-compression mode at BESSY, a time resolution of about 15 ps has been obtained. Further, we discuss an all-optical pump-probe technique using femtosecond laser excitation. A highly promising alternative to stroboscopic imaging is an approach using time-resolved image detection. As a second application of time-resolved PEEM we discuss potential ways of aberration correction. These approaches go back to the old ideas of Scherzer in the light of stateof-the-art equipment. The excellent time structure of synchrotron radiation or pulsed lasers along with advanced methods of time-resolved image detection and fast electronic pulsers opens ways for driving the resolution limit of a PEEM into the range of a few nanometers.

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“…Since this bunch compression technique can be used with every bunch, it yields significant improvements in average flux over laser slicing. Schönhense et al used this special mode in a field-driven pump-probe PEEM experiment on micro-scale NiFe square and rectangular structures [162], obtaining a time resolution in imaging of 15 ps [163]. These experiments revealed several transient features of the magnetization process, including blocked domains and transient domain walls and vortices.…”

Section: Short Pulse Sources At Storage Rings For Improved Time Resol...mentioning

confidence: 99%

Studies of nanomagnetism using synchrotron-based x-ray photoemission electron microscopy (X-PEEM)

Cheng¹,

Keavney²

2012

Rep. Prog. Phys.

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As interest in magnetic devices has increased over the last 20 years, research into nanomagnetism has experienced a corresponding growth. Device applications from magnetic storage to magnetic logic have compelled interest in the influence of geometry and finite size on magnetism and magnetic excitations, in particular where the smallest dimensions reach the important magnetic interaction length scales. The dynamical behavior of nanoscale magnets is an especially important subset of research, as these phenomena are both critical for device physics and profoundly influenced by finite size. At the same time, nanoscale systems offer unique geometries to promote and study model systems, such as magnetic vortices, leading to new fundamental insights into magnetization dynamics. A wide array of experimental and computational techniques have been applied to these problems. Among these, imaging techniques that provide real-space information on the magnetic order are particularly useful. X-ray microscopy offers several advantages over scanning probe or optical techniques, such as high spatial resolution, element specificity and the possibility for high time resolution. Here, we review recent contributions using static and time-resolved x-ray photoemission electron microscopy to nanomagnetism research.

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Transient spatio-temporal domain patterns in permalloy microstructures induced by fast magnetic field pulses

Cited by 6 publications

References 31 publications

Influence of magnetocrystalline anisotropy on the magnetization dynamics of magnetic microstructures

Influence of magnetocrystalline anisotropy on the magnetization dynamics of magnetic microstructures

PEEM with high time resolution—imaging of transient processes and novel concepts of chromatic and spherical aberration correction

Studies of nanomagnetism using synchrotron-based x-ray photoemission electron microscopy (X-PEEM)

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