Self-biasing circulators operating at K/sub a/-band utilizing M-type hexagonal ferrites

Evolution of the magnetic properties during the thermal treatment of nanosize BaMFe11O19 (M=Fe, Co, Ni and Al) obtained through aerosol route

“…The technological applications of the hexagonal ferrites have in the past decades attracted lots of interest in their intrinsic physical properties [5,6]. Such ferrites show a very high uniaxial magnetic anisotropy and can be used as a permanent magnetic material, which in some applications can compete technically as well as economically, with other permanent magnets [7,8]. M-type hexagonal ferrites, MFe 12 O 19 (M=Ba, Sr and Pb) have been intensively investigated as materials for permanent magnet, high-density recording media and microwave devices [9,10].…”

M-Type Barium Hexagonal Ferrite Films

“…10,[18][19][20][21][22][23][24] Such devices include (1) notch filters made of BaM thin films and microstrip geometry, (2) notch filters made of BaM slabs and strip-line geometry, (3) selfbiased notch filters using high-M r BaM thin films and coplanar waveguide (CPW) geometry, (4) notch filters based on the excitation of confined magnetostatic waves in narrow BaM strips and CPW configurations, and (5) phase shifters using BaM thin films and CPW geometry. This section describes the device configurations and responses of (3), (4), and (5).…”

“…Emphasis has been placed on the optimization of deposition processes for low-loss, self-biased BaM thin films, 7,8,9,10 the deposition of BaM thin films on "non-conventional" substrates, such as semiconductor substrates 11,12,13,14 and metallic substrates, 15 the fabrication of BaM thick films on semiconductor substrates, 16,17 the demonstration of BaM-based planar mm-wave devices, 18,19,20,21,22,23,10,24 the development of BaM-based ferromagnetic/ferroelectric heterostructures, 25,26,27,28,29 and the study of multiferroic effects in single-phase BaM materials. 30 A variety of different techniques have been used to fabricate BaM film materials.…”

“…16,17 The device demonstration includes both numerical 20,21,22 and experimental efforts. 18,21,22,23,10,24 The devices demonstrated include phase shifters, 21 filters, 22,23,10 ,24 circulators, 18 and isolators. 19 This chapter reviews the main advances made in the field of BaM materials and devices over the past five years.…”

Mössbauer studies for La–Co substituted strontium ferrite

“…M-type strontium ferrite has been intensively investigated as a material for permanent magnets, high-density recording media, and microwave device [1,2]. To improve the magnetic properties, many studies on cation substitution have been carried out since intrinsic magnetic properties such as saturation magnetization and magnetic anisotropy depend on the cation configuration [3][4][5][6].…”