FMR linewidth of barium hexaferrite at millimeter wavelengths

Recent advances in processing and applications of microwave ferrites

“…The smallest linewidths obtained for LPE grown epitaxial barium hexaferrite on single crystal hexagallate (SrGa 12 O 19 ) substrates were $45 Oe at 60 GHz [66]. These values should be compared with DHo10 Oe for the best barium hexaferrite single crystal sphere [54,67,68] and a value of $10 Oe predicted for Mn-doped hexagonal ferrite [69,70]. Recently, hexagonal ferrite films having the c-axis perpendicular to the substrate plane have been grown by LPE on PLD grown seed layers on commercially available substrates [71][72][73][74][75].…”

Investigation into the structural features and microwave absorption of doped barium hexaferrites

“…25 The application of substituted M-type barium hexaferrites with a large constant of magnetocrystalline anisotropy as fillers in composite materials allows for the frequency selective absorption of EMR, using the controlled resonances of domain boundaries and the rotation of magnetization (natural ferromagnetic resonance, NFR). It is known that the absorption peak of BaFe 12 O 19 M-type barium hexaferrite lies in the range of ∼47-50 GHz, 26 whereas the substitution of the iron cations with Mn 2+ , Co 2+ and Ti 4+ cations reduces the absorption maximum down to 13.4 GHz. 5 It is considered that losses at high frequencies are generally caused by NFR.…”

Single crystal growth from the melt and magnetic properties of hexaferrites–aluminates

“…There are different devices of resonance type (filters, phase circulators, etc.) and multiferroic structures [1][2][3][4][5][6][7][8][9]. The most popular hexaferrites, pure Ba and Sr, have magnetic anisotropy fields of 17 and 19 kOe, respectively.…”