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| Schematic representation of a 2D dipolar droplet. The grey droplet represents a 2D array of interacting tilted dipoles. The dipoles are tilted by a static field in the ^z direction, oriented at 0, 0 relative to the lattice basis fX; Y; Zg.Rij is a vector connecting dipoles in the XY plane. |
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| (a) Electron diffraction pattern from the [112] zone axis taken at room temperature from a region of diameter 880 nm with an exposure of 70 s. The +-1/2[111] superlattice are indicated by arrows. (b) Electron diffraction pattern from the same region taken at 563 K, above the Ne´el temperature TN ¼ 523 K, showing that the superlattice reflections are no longer present. |
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| Assembly of NPs interacting with three different dipolar interaction strengths (assembly concentration p = 0.5). (a) Initial magnetization vs H curves (VC) at temperature t = 0.005 and (b) ZFC/FC magnetization vs T curves with hcool = 0.05. |
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| Protein cages such as ferritin and viral capsids are interesting building blocks for nanotechnology due to their monodisperse structure and ability to encapsulate various functional moieties. Here we show that recombinant ferritin protein cages encapsulating Fe3O4–γ-Fe2O3 iron oxide (magnetoferritin) nanoparticles and photodegradable Newkome-type dendrons self-assemble into micrometer-sized complexes with a face-centered-cubic (fcc) superstructure and a lattice constant of 13.1 nm. |
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a, Native CCMV with RNA genome inside. b, Apoferritin and magnetoferritin (recombinant ferritin cage from Pyrococcus furiosus encapsulating Fe3O4–γ-Fe2O3). c, Gold nanoparticle stabilized with an amphiphilic ligand featuring a cationic quaternary amine end-group. d, Size of the building blocks drawn to scale.
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| Electron micrograph of a Magnetospirillum cell with magnetosomes arranged in a chain. |
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| (a) and (b) Bipolar TS scan at 20K and 130K under FC condition indicatingthe anisotropy fields and g, (c) temperature dependence of g, (d) temperature dependence of shift in the first anisotropy peaks in the bipolar scans. |
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| (a), (b) Schematic of the sample. The spin-wave waveguide is 2 mm long, 20 m wide, and made from 100 nm thick Permalloy on a GaAs substrate. The coplanar waveguide for rf excitation and the leads for dc voltage measurements are made from 150 nm thick Au. The CPW has a signal linewidth of 10 m and a signal-to-ground-line separation of 5 m. (c) Illustration of the z distribution of the dissipated power and resulting temperature profile. |
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| Typical hysteresis loops corresponding to 10 nm diameter magnetite particles for increasing values of N, the number of particles/cc. The inset shows M=Ms for the two lower concentrations to clarify the deviation from the Langevin response (for N ¼ 1010) to the emergence of hysteresis loops with increasing concentrations (interactions). |
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| (a) The M(H) curves of the HNSs sample and the MnCO3 bulk at T = 5 K for the magnetic field sweep ±50 kOe. The inset shows the hysteresis curves on an expanded scale around the H = 0 origin. (b) The M − χAFMH curves, by subtracting the linear (AFM-type) contribution from the measured magnetization data. Away from the hysteretic region, only the curves of the up-field run are shown. The inset shows the pure FM hysteresis loops MFM(H) on an expanded scale. |
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| Concept of the STE coating. a, Conventional TE generation method based on the Seebeck effect. The TE device contains a number of thermocouples (TCs), electrically connected in series, to obtain reasonable output voltage. The TE device is usually attached externally to heat sources, which apply the temperature difference across it. b, STE coating based on the SSE. The STE coating exhibits a straightforward scaling: a larger film area leads to a larger TE output. Such a simple film structure can be directly coated onto heat sources with different shaped (curved or uneven) surfaces. |
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