Electromagnetic and microwave absorbing properties of Co2Z-type hexaferrites doped with La3+

Structural, dielectric and magnetic properties of Nd-doped Co2Z-type hexaferrites

“…M is the molar mass, m is mass of pellet, r is radius of the pellet, N A is Avogadro's number, Z is the number of molecules per unit cell (Z = 2 for Ztype hexaferrite). As shown in [3]. Variation of lattice parameters (a, c) as a function of Nd content is shown in Fig.…”

“…This material is one of the most widely used soft materials, instead of spinel ferrite, for high-frequency application, such as chip inductors, LC filters and megahertz-gigahertz (MHz-GHz) antenna [2]. From the crystallographic point of view, Z-type ferrite is among the most complex compounds in the families of hexaferrites with planar hexagonal structure [3]. This structure may be described as a stack of six kinds of blocks, R, S, T, R*, S* and T*, where R, S, and T are independent and the asterisk indicates the same stack but rotated 180 • around the c-axis.…”

“…The stacking order is RSTSR*S*T*S* [4]. Z-type hexaferrite can be treated as a sum of two simple hexaferrites, namely, M-(BaFe 12 O 19 ) and Y-(Ba 2 Me 2 Fe 12 O 22 ) types [3]. The dielectric and magnetic properties of hexaferrites such as, permittivity, permeability, coercivity and saturation magnetization can be controlled by substitution of divalent or trivalent ions.…”

Synthesis and enhanced microwave absorption properties of PVB/Co 2 Z/RGO layered composite

“…To date, composites of the above materials are the ideal candidates in EM wave absorbing and shielding fields, such as (100-x)La 1.5 Sr 0.5 NiO 4 /xNiFe 2 Hexaferrites, classified into M-, W-, Y-, Z-, X-and U-type according to their chemical formulas and structures, have been widely used in microwave and millimeter wave devices as permanent magnets or gyromagnetic materials, e.g., in circulators, filters, isolators, inductors, and phase shifters [16][17][18][19] . Z-type hexagonal barium ferrites (Co 2 Z) with hexagonal planar structure can be applied in the gigahertz region due to their significant permeability, relatively high frequency response, strong magnetocrystalline anisotropy field and high cut-off frequency [20][21][22] . Some work M A N U S C R I P T…”

Broadband and thin microwave absorber of nickel–zinc ferrite/carbonyl iron composite

“…Microwave absorbers with broadband and thin thickness have been developed to eliminate EMI [1][2][3][4][5][6][7][8], and soft magnetic materials are specially focused with much interest in this field [4][5][6][7][8]. It is well known that the reflection and attenuation characteristics of absorbers are associated with complex permeability ( r = − j ), permittivity (ε r = ε − jε ) and electromagnetic impedance match [9].…”