Complex permeability and microwave absorption properties of Y₂Fe₁₇ micropowders with planar anisotropy

Abstract

Planar anisotropy Y2Fe17 powders were fabricated by rapid quenching and ball-milling techniques. The frequency dependence of complex permeability and permittivity of paraffin composites with 35 vol% Y2Fe17 powders have been investigated in the frequency range 0.1–10 GHz. The oriented composite shows a dramatic increase in permeability and a remarkable decrease in the matching thickness. The minimum reflection losses of unoriented Y2Fe17 composite and oriented Y2Fe17 composite were −48 dB at 2.34 GHz and −59 dB at 3.4 GHz, and the corresponding thicknesses were only 3.9 mm and 2.3 mm, respectively. Otherwise, the product of the static permeability and the resonance frequency for the oriented Y2Fe17 compound is 91.6 GHz, which is much higher than the value of 15.3 GHz calculated by Snoek's limit equation. Hence, the Y2Fe17 composite, with the specific property of the planar anisotropy, has great potential applications in the field of high-frequency microwave absorption.

Kinetics of hydrogen-induced reverse phase transformation in Y2Fe17 hard magnetic alloy

“…For instance, R 2 M 17 type compounds demonstrate very interesting magnetic phenomenon during their interaction with interstitial atoms (H, N, C, B) [3][4][5] and because of this Y 2 Fe 17 compound has great potential applications in the field of high-frequency microwave absorption [6].…”

A General Method for the Large‐Scale Preparation of Multifunctional Magnetic Sm‐Fe/Co Nanomaterials

“…[14] As a result, they become an ideal high-frequency magnetic material for applications in electromagnetic compatibility field to protect the electronic devices from high-frequency electromagnetic wave. [15][16][17][18][19] The fabrication to nanostructured RE-Fe/Co, especially nanoparticles (NPs), is an essential first step toward development of high-performance magnetic materials. [20][21][22][23][24][25] With dimension-tunable magnetic properties, these NPs can be made with either large coercivity or high magnetic moment, making it possible to prepare magnets with high energy products or high-frequency absorbers that are key to miniaturizing magnetic and electronic components.…”

Spontaneous Biskyrmion Lattice in a Centrosymmetric Rhombohedral Rare-Earth Magnet with Easy-Plane Anisotropy

“…Considering the various stabilization mechanisms of topological magnetic textures, the role of external magnetic field may, in principle, be replaced with another intrinsic interaction energy to spontaneously generate skyrmions. Therefore, the intrinsic bi-anisotropy in the easy-plane magnet , might provide new possibilities to realize such experimental conditions. Theoretically, the possible presence of skyrmions in the magnetic materials with easy-plane anisotropy has been discussed in the itinerant magnets with the RKKY interaction .…”

“…(d) Ratio between effective anisotropy and stray field energies K eff /(μ 0 M s 2 /2) at various temperatures. (e) Schematic of magnetization under easy-plane anisotropy, where H θ and H φ are the effective anisotropy fields when the magnetization deviates from the easy axis ( b axis here) in the hard plane ( y – z ) and in the easy plane ( x – y ), respectively . Normally, H θ is much larger than H φ for magnetic materials with planar anisotropy.…”

“…(e) Schematic of magnetization under easy-plane anisotropy, where H θ and H φ are the effective anisotropy fields when the magnetization deviates from the easy axis (b axis here) in the hard plane (y−z) and in the easy plane (x−y), respectively. 28 Normally, H θ is much larger than H φ for magnetic materials with planar anisotropy. (f) Simulated spin texture using magnetic parameters at 260 K without any external magnetic field, where the arrows with different colors represent the magnitude and direction of magnetization, while green (−m y ) and orange (+m y ) regions display downward and upward magnetization.…”