TSol-gel chemistry, while being extremely established, is to this day not fully understood, and much of the underlaying chemistry and mechanisms are yet to be unraveled. Here, we elaborate on...
Utilizing the molecular
beam epitaxy technique, a nanoscale thin-film
magnet of c-axis-oriented Sm2Co17 and SmCo5 phases is stabilized. While typically in the
prototype Sm(Co, Fe, Cu, Zr)7.5–8 pinning-type magnets,
an ordered nanocomposite is formed by complex thermal treatments,
here, a one-step approach to induce controlled phase separation in
a binary Sm–Co system is shown. A detailed analysis of the
extended X-ray absorption fine structure confirmed the coexistence
of Sm2Co17 and SmCo5 phases with
65% Sm2Co17 and 35% SmCo5. The SmCo5 phase is stabilized directly on an Al2O3 substrate up to a thickness of 4 nm followed by a matrix of Sm2Co17 intermixed with SmCo5. This structural
transition takes place through coherent atomic layers, as revealed
by scanning transmission electron microscopy. Highly crystalline growth
of well-aligned Sm2Co17 and SmCo5 phases with coherent interfaces result in strong exchange interaction,
leading to enhanced magnetization and magnetic coupling. The arrangement
of Sm2Co17 and SmCo5 phases at the
nanoscale is reflected in the observed magnetocrystalline anisotropy
and coercivity. As next-generation permanent magnets require designing
of materials at an atomic level, this work enhances our understanding
of self-assembling and functioning of nanophased magnets and contributes
to establishing new concepts to engineer the microstructure for beyond
state-of-the-art magnets.
From macroscopic heavy-duty permanent magnets to nanodevices, the precise control of the magnetic properties in rare-earth metals is crucial for many applications used in our daily life. Therefore, a detailed...
The implementation of anisotropy to functional materials is a key step towards future smart materials. In this work, we evaluate the influence of preorientation and sample architecture on the strain-induced...
Nanoscaled magnetic particle ensembles are promising building blocks for realising magnon based binary logic. Element-specific real-space monitoring of magnetic resonance modes with sampling rates in the GHz regime is imperative for the experimental verification of future complex magnonic devices. Here we present the observation of different phasic magnetic resonance modes using the element-specific technique of Time-Resolved Scanning Transmission X-ray Microscopy (TR-STXM) within a chain of dipolarly coupled Fe3O4 nanoparticles (40-50 nm particle size) inside a single cell of a magnetotactic bacterium \textit{Magnetospirillum Magnetotacticum}. The particles are probed with 25~nm resolution at the Fe L3 X-ray absorption edge in response to a microwave excitation of 4.07 GHz. A plethora of resonance modes is observed within multiple particle segments oscillating in- and out-of-phase, well resembled by micromagnetic simulations.
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