Magnetic resonance in spherical Co-Ni and Fe-Co-Ni particles

Analyses on multiple resonance behaviors and microwave reflection loss in magnetic Co microflowers

“…In our experiment, the m 00 spectra should be a broad resonance band, and it can be phenomenologically analyzed to have three overlapped resonance peaks in the 0.1-11 GHz range. These broadening peaks are also observed in the Co particle system [25,26] and other systems [27,28]. The solid lines in Fig.…”

Magnonic Metamaterials

“…The age of nanotechnology therefore sets an intriguing quest for additional benefits to be gained by structuring natural magnetic materials into so called magnonic metamaterials, in which the frequency and strength of resonances based on spin waves (magnons) 8 are determined by the geometry and magnetization configuration of meta-atoms. Spin waves can have frequencies of up to hundreds of GHz (in the exchange dominated regime) [6][7][8][9] and have already been shown to play an important role in the high frequency magnetic response of composites [10][11][12][13][14] . Moreover, in view of the rapid advances in the field of magnonics 9,15,16, , which in particular promises devices employing propagating spin waves, the appropriate design of magnonic metamaterials with properties defined with respect to propagating spin waves rather than electromagnetic waves acquires an independent and significant importance.…”

Magnetic field-induced solvothermal synthesis of one-dimensional assemblies of Ni-Co alloy microstructures

“…As one important class of transition metal alloys, Ni Co alloys have high mechanical strength [7], good wear resistance [8], anticorrosive performance [9], thermal conductivity [10], thermal stability [11], electrical conductivity, electrocatalytic activity [12,13], and specific magnetic properties [14,15], indicating that Ni Co alloys should be good high-temperature catalysts and specific magnetic materials, and that they can be applied in some high-temperature electrochemical devices, such as solid oxide fuel cells (SOFCs) [16] and some electromagnetic devices, such as magnetic recording devices, ferrofluid dynamotors, and magcards [17,18].…”