Magnetism and magnetoresistance of single Ni–Cu alloy nanowires

• Andreea Costas,
• Camelia Florica,
• Elena Matei,
• Maria Eugenia Toimil-Molares,
• Ionel Stavarache,
• Andrei Kuncser,
• Victor Kuncser and
• Ionut Enculescu

Beilstein J. Nanotechnol. 2018, 9, 2345–2355, doi:10.3762/bjnano.9.219

• perpendicular geometry is almost insensitive to values of the stiffness constant, but decreases strongly with the saturation magnetization. The evolution of the spin structure of the wire is similar to one of a magnetic monodomain, with gradual in-field reorientation for almost all spins (only the outermost

• inset. A deviation of the wire axis from the orthogonal axis of about 10° was considered. The evolution of the spin structure at four different decreasing field values is graphically presented on the right-hand side of the figure (the positive field is oriented almost perpendicular to the wire toward

Influence of the thickness of an antiferromagnetic IrMn layer on the static and dynamic magnetization of weakly coupled CoFeB/IrMn/CoFeB trilayers

• Deepika Jhajhria,
• Dinesh K. Pandya and
• Sujeet Chaudhary

Beilstein J. Nanotechnol. 2018, 9, 2198–2208, doi:10.3762/bjnano.9.206

• AF-induced interfacial damping parameter is also calculated. At low temperatures, the asymmetric hysteresis loop and training effect indicates the presence of a dynamic AF spin structure instead of a static structure. Experimental FM/AF/FM trilayers of Co20Fe60B20 (10 nm)/Ir19Mn81 (tIrMn)/Co20Fe60B20

• exchange coupling mediated by the AF spin structure. The weak interlayer exchange coupling due to the large separation of the CoFeB layers causes the magnetization in each layer to precess almost independently. Each CoFeB layer resonance precession drags the magnetization of the other layer and the

• spin structure and interfacial exchange coupling in the trilayers. The M–H loops of the trilayer samples recorded at room temperature (RT) for different tIrMn are presented in Figure 7a. A single square-shaped loop (Mr/Ms ≈ 1) is obtained for tIrMn ≤ 6 nm, which indicates that the magnetization

Inverse proximity effect in semiconductor Majorana nanowires

• Alexander A. Kopasov,
• Ivan M. Khaymovich and
• Alexander S. Mel'nikov

Beilstein J. Nanotechnol. 2018, 9, 1184–1193, doi:10.3762/bjnano.9.109

• and . According to the definitions for the quasiclassical Green’s functions (Equation 9 and Equation 10) and due to a specific spin structure of the Zeeman term and spin–orbit coupling term in Equation 17–Equation 20, one can easily get that only gk0 and gky are nonzero. It is convenient to rewrite

Effect of large mechanical stress on the magnetic properties of embedded Fe nanoparticles

• Srinivasa Saranu,
• Sören Selve,
• Ute Kaiser,
• Luyang Han,
• Ulf Wiedwald,
• Paul Ziemann and
• Ulrich Herr

Beilstein J. Nanotechnol. 2011, 2, 268–275, doi:10.3762/bjnano.2.31

• of the particles. On the other hand it is well-known that the particle surfaces may lead to additional anisotropies in nanoparticles. For example, in Co nanoparticles this leads to size dependent effective anisotropies [32]. As a result, the spin structure can assume a non-collinear state as a

• increase the influence of local surface anisotropies on the local spin structure. Finally, it is noted that the contribution of Kme to the anisotropy in magnetic nanoparticles may be combined with any of the other contributions as given in Equation 1. It may therefore be useful for the optimization of the

Magnetic interactions between nanoparticles

• Steen Mørup,
• Mikkel Fougt Hansen and
• Cathrine Frandsen

Beilstein J. Nanotechnol. 2010, 1, 182–190, doi:10.3762/bjnano.1.22

• : dipole interactions; exchange interactions; spin structure; superferromagnetism; superparamagnetic relaxation; Review Introduction In nanostructured magnetic materials, interactions between, for example, nanoparticles or thin films in multilayer structures often play an important role. Long-range

• , but it depends on the timescale of the experimental technique. If magnetic interactions between the particles are not negligible, they can have a significant influence on the superparamagnetic relaxation. Furthermore, the spin structure of nanoparticles can be affected by inter-particle interactions

• . In this short review, we first discuss how the superparamagnetic relaxation in nanoparticles can be influenced by magnetic dipole interactions and by exchange interactions between particles. Subsequently, we discuss how the spin structure of nanoparticles can be influenced by inter-particle exchange