Simulation of the contribution of magnetic films on planar inductors characteristics

Gamet, Émilie; Chatelon, Jean-Pierre; Rouiller, T.; Bayard, Bernard; Noyel, G.; Rousseau, Jean‐Jacques

doi:10.1016/j.jmmm.2004.08.029

Cited by 13 publications

(6 citation statements)

References 10 publications

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“…The inductance is calculated based on a classical circuit as shown in Figure a, where R s is the DC resistance, the L s is the inductance and C s is the inherent capacitance of the inductor. The quality factor of an inductor can be expressed as Q = ωL / R , [ 29 ] here, ω is angular frequency, L stands for the total inductance, and R accounts for the metal resistance. Here we change the number of coil turns ( N ), the width ( W ) and thickness ( T ) of the wire to study their influences on the inductance, which is illustrated in Figure 2b‐c.…”

Section: Resultsmentioning

confidence: 99%

Flexible Mini‐Inductors with Ultra‐High Inductance Density Directly Cut from Soft Magnetic Amorphous Alloys by Femtosecond Laser

Chen,

Zhang,

Wang

et al. 2024

Adv Funct Materials

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Inductors are indispensable parts in power modules of electronic devices. With the rapid development of flexible and wearable electronic devices, developing flexible micro‐inductors with large energy storage has become an urgent task. In this research, a sophisticated femtosecond laser ablation technique is employed to craft circular spiral mini‐inductors via selective etching of soft magnetic amorphous alloy ribbons. Remarkably, while these inductors possess dimensions akin to human fingerprints, they demonstrate an impressively elevated inductance value of ≈1.15 µH at 1 MHz. The inductance density is ≈280–390 nH mm−2, which is ≈10 times larger than conventional circular spiral inductors and is attributed to the high permeability of the amorphous alloys. Furthermore, the inductors showcase commendable flexibility, marked by stellar elasticity and a bending endurance exceeding 2500 cycles, thanks to the amorphous alloys' superior elastic strain limit. When integrated with an LM2576‐3.3BT buck converter, the fabricated inductor achieved a peak power conversion efficiency nearing 70%. These findings underscore the potential of such flexible mini‐inductors in the landscape of flexible electronics.

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Section: Resultsmentioning

confidence: 99%

Flexible Mini‐Inductors with Ultra‐High Inductance Density Directly Cut from Soft Magnetic Amorphous Alloys by Femtosecond Laser

Chen,

Zhang,

Wang

et al. 2024

Adv Funct Materials

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“…Thin and thick layers of YIG have been used in our Laboratory to study different integrated passive components [3][4][5][6]. While studying these devices, we have encountered several mechanical and electrical problems: cracks, detachment of YIG or Cu films from the substrate, deterioration of Cu films, open or short circuit.…”

Section: Resultsmentioning

confidence: 99%

“…The characterization of these films is of great interests in magneto-optics, microwaves and radiofrequency domains. They are used in our Laboratory for the miniaturization of magnetic devices as planar inductors and transformers [1][2][3] and also for the integration of microwaves passive components like resonators, isolators and circulators [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence of annealing in vacuum and in air on magnetic, crystallographic and morphological properties of thin YIG films

Siblini

Khalil

Chatelon

et al. 2013

EPJ Web of Conferences

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Abstract. The Yttrium Iron Garnet (YIG) is chosen by our laboratory for the integration of passive components in the microwaves domain and for the miniaturization of integrated inductors and transformers. Magnetic and morphological characterizations are essential for the development of these components. To fabricate a micro-inductor of solenoid type, we have deposited on an alumina substrate, by RF sputtering, a thin YIG film between two layers of copper. We have also used the photolithography technique in a clean room to obtain the desired pattern of the coil. The YIG films are amorphous after deposition, the annealing at 740°C for 2 hours is necessary for them to be crystallized and to have magnetic properties. To avoid the deterioration of copper layers, the Classical Thermal Annealing (CTA) was replaced by a Vacuum Thermal Annealing (VTA). Before manufacturing the integrated inductor, it is interesting to do the magnetic, crystallographic and morphological characterizations of YIG films after annealing with both techniques of thermal treatment. To check the quality of the prototype, we have done different characterizations: VSM, Kerr effect, XRD, SEM. The results obtained with VTA were better than of CTA comparing them with bulk YIG properties.

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“…Considerable research has been recently devoted to the characterization of magnetic thin films for their wide range of applications. The miniaturization of compact magnetic devices for high‐frequency communication over the last few years has seriously progressed, such as thin‐film inductors and transformers, with low core loss 1–5. Yttrium iron garnet (YIG) materials are of great interest in magneto‐optical and microwave communication industries due to their low dielectric loss, high resistivity (2.5 × 10 6 Ω m) and narrow absorption line width in the X‐band frequency range (8–12 GHz).…”

Section: Introductionmentioning

confidence: 99%

Improvement of the multilayer morphology (alumina/Cu/YIG/Cu) to characterize YIG thin film

Khalil

Siblini

Chatelon

et al. 2011

Physica Status Solidi (a)

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International audienceThe aim of our study is to characterize yttrium iron garnet (YIG) thin film for its applications in the microwaves and magnetooptical domains. For this purpose, we have manufactured a microinductor by deposition of YIG film between two copper layers on an alumina substrate. Multilayers have been deposited by radio-frequency magnetron sputtering technique. Thin films of YIG are amorphous after deposition; a post-thermal annealing at 740 8C for 2 h is necessary to obtain satisfactory magnetic properties. In this work, we have studied the effects of different parameters concerning the substrate surface state, deposition and post-thermal treatment of YIG and copper thin films on their structure and morphological properties. We have come against several mechanical and electrical problems: crack formation, detachment of YIG or Cu films from the substrate, deterioration of Cu films, open or short circuits. The roughness of alumina substrate and the annealing mode play an important role on the quality of themicroinductor prototype. After several tests by varying different parameters, we have established a protocol permitting to manufacture a prototype of good quality. This prototype is characterized using: profilometry, scanning electron microscopy, X-ray diffraction, vibrating sample magnetometry, and a precision LCR meter

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Simulation of the contribution of magnetic films on planar inductors characteristics

Cited by 13 publications

References 10 publications

Flexible Mini‐Inductors with Ultra‐High Inductance Density Directly Cut from Soft Magnetic Amorphous Alloys by Femtosecond Laser

Flexible Mini‐Inductors with Ultra‐High Inductance Density Directly Cut from Soft Magnetic Amorphous Alloys by Femtosecond Laser

Influence of annealing in vacuum and in air on magnetic, crystallographic and morphological properties of thin YIG films

Improvement of the multilayer morphology (alumina/Cu/YIG/Cu) to characterize YIG thin film

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