Ferrites have emerged out as excellent material for a broad spectrum of applications. Thick films of these materials have great demand for energy and advanced electronics. This review highlights a brief overview of the spinel-type of ferrite thick films (S-FTFs) development right from their historical developments, preparation strategies and state of art applications. The fabrication of S-FTFs includes the discussion on screen-printing, doctor blade tape casting, plasma spray, and spin coating. The comparative analysis of the screen printing technique to the other methods is provided to assist the scientific community during the process of choosing the most suitable fabrication technique. The influence of the synthesis parameters such as temperatures (pre-sintering and final sintering), binders (organic and inorganic), sizes (crystallite, grain, and particle), substrate material and the final heat treatment process in S-FTFs, and the preparation of the ferrite powders and their fabrication technique are review and summarized. Moreover, this review provides a brief overview of the S-FTFs applications, which are classified into four broad categories: sensors, microwave, magnetic and advanced applications. This classification provides a deeper insight into the potential of the S-FTF applications. The motivation in materializing the review of S-FTFs technology is to inspire aspiring research candidates and boost their research interest in this particular field.

A review of spinel-type of ferrite thick film technology: fabrication and application

Consideration of temperature and anisotropy effects in hysteresis modelling allows for tailoring the operation point of magnetic circuits. The recently modified Jiles–Atherton model has been extended to describe the hysteresis loops in MnZn ferrites for two temperatures below the Curie point. Anisotropy is modelled by a proper choice of the value of the quantum number J in the Brillouin function.

https://iopscience.iop.org/article/10.1088/0022-3727/43/1/015005/pdf

Modelling magnetic properties of MnZn ferrites with the modified Jiles?Atherton description

Growth temperature dependence of the hysteretic behavior of Ni0.5Zn0.5Fe2O4 thin films

Effect of external magnetic field on the crystal growth of nano-structured ZnxMn1−x+yZryFe2−2yO4 thin films

Some physical concepts important for a hysteresis model (effective field, an- hysteretic magnetization) are discussed on the example of Jiles-Atherton model. The Jiles-Atherton model reveals some drawbacks, which make this model more difficult to be applied in electrical engineering. In particular, it does not describe accurately the mag- netization curves after a reversal, moreover complex magnetization cycles are poorly re- presented. On the other hand, the phenomenological description proposed by Takacs seems to be a valuable alternative to the Jiles-Atherton formalism. The concept of ef- fective field may be easily incorporated in the description.

/pdf/higher-order-reversal-curves-in-some-hysteresis-models-4svoxyig9s.pdf

Higher order reversal curves in some hysteresis models

The growth of magnetically soft ferrite thin films, particularly Mn-Zn ferrite, is motivated by potential applications [1, 2]. Given their low conductivity, they are used for high frequency applications. For op-timum performance at these high frequencies also, their magnetic hysteresis should be as low as possible. This last property is related to domain wall motion, and several studies have been performed on the do-main structure of poly-crystalline MnZn and NiZn ferrites, and their relationship to the average grain size [3, 4]. It is known that due to low magneto-crystalline anisotropy of certain MnZn- ferrite compositions, the domain wall size can be in the order of 1 µm; so the grain size domain can be varied from below to above the domain wall size [5]. In the first case, the grains are mono-domain, and their behavior is radi-cally different to the multi-domain case. This critical grain size, Lc, for the MnZn ferrites has been re-ported as 4µm [5]. In samples of several magnetic materials, with grain size L< Lc the magnetic suscep-tibility results, and coercivity behavior indicated the absence of domain walls in these small grains [6]. The magnetic quality of ferrite films is also mainly dependent on the extrinsic properties, e.g. morpho-logical properties like mono and multidomain structures, grain size distribution, grain boundary, and defects. The properties above have a direct influence on some parameters of the hysteresis behavior; especially the coercive field is highly sensible to the above mentioned properties. The hysteresis beha-vior of magnetically soft ferrite can be fitted well to the Jiles-Aterton Model (JAM)[7, 8]. Such a proce-

Pinning energy of domain walls in MnZn ferrite films

En este trabajo se generan las curvas de histeresis para ferromagneticos blandos a partir del modelo de Jiles-Atherton .En el marco del modelo se discute la influencia del anclaje de las paredes de los dominios en la estructura de la histeresis y su influencia en el campo coercitivo. Los resultados se comparan con los resultados experimentales obtenidos para ferritas de NiZn.Para el calculo de los lazos de histeresis se usa la expresion: Mi = M[Mi-1 (Hi-1),Hi] + C .

Simulaciones de comportamientos histeréticos blandos en películas magnéticas

Utilizando el formalismo macroscopico del Efecto Kerr, se simulo la respuesta magneto-optica (MO) de multicapas de (Cox/Ptx)n y (Cox/Pdx)n, variando x (espesor de monocapa) y n su periodi-cidad. Posteriormente se simulo la respuesta de las mismas multicapas con recubrimientos de Pd y Pt. Con la variacion de dichos parametros se observa la transicion entre efectos MO Faraday-Kerr (TF-K). Se presenta una superficie de TF-K como funcion de dichos parametros.

Simulación de la respuesta magneto-óptica en multicapas magnéticas

Thin films were deposited by RF sputtering in oxygen atmosphere of the ferrite dopped with Mn and Zn in the Mn0.5Zn0.5Fe2O4 composition. We investigated their magnetic properties and its dependence with the thickness. Magnetic hysteresis loops were measured by a MOKE system (Magneto-Optical Kerr Effect) at room temperature. A critical grain size was observed, in which the pinning reaches its maximum value, suggesting the change from a monodomain to a multidomain regime. The hysteresis curves were evaluated by a phenomenological model that allows to evaluate the k pinning parameter, which governs such behaviour. A correlation between the size of the superficial structures of the film and the strength of the pinning is suggested.

Efecto del espesor de películas de ferritas de MnZn sobre su respuesta magnética

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Pinning energy of domain walls in MnZn ferrite films

Simulaciones de comportamientos histeréticos blandos en películas magnéticas

Simulación de la respuesta magneto-óptica en multicapas magnéticas

Efecto del espesor de películas de ferritas de MnZn sobre su respuesta magnética