摘要:
By using a DM (discontinuous multilayer) structure formed of ferromagnetic metal in amorphous state and amorphous metal different from the ferromagnetic metal, a magnetic thin film for high frequencies is realized that has a high magnetic permeability in a high-frequency region of a GHz band and that has a high saturated magnetization. This magnetic thin film for high frequencies is preferably provided so that: (i) the ferromagnetic metal is predominantly composed of Fe or FeCo and contains one or more elements selected from the group of C, B, and N and the amorphous metal is a Co-base amorphous alloy; and (ii) the amorphous metal is CoZrNb.
摘要:
There is provided a soft magnetic member comprising a resin film 11 and a soft magnetic layer formed on the resin film 11, the soft magnetic layer comprising a T-L composition layer 7, wherein T is Fe or FeCO, and L is at least one element selected from the group consisting of C, B and N, and a Co based amorphous alloy layer 3 formed on either of the surfaces of the T-L composition layer 7. The Co based amorphous alloy layer 3 is combined with the T-L composition layer 7 to give a magnetic thin film for high frequency simultaneously exhibiting a high permeability and a high saturated magnetization. The magnetic thin film for high frequency can be formed on the resin film 11 because the magnetic thin film can exhibit excellent properties without a high-temperature heat treatment.
摘要:
A high frequency magnetic thin film characterized by comprising a first layer made of a T-L composition (here, T is Fe or FeCo, and L is one or more of C, B, and N) and a second layer comprising a Co-based amorphous alloy arranged on either of the surfaces of the first layer. The high frequency magnetic thin film is a multilayer film of a plurality of the first layers and a plurality of the second layers or desirably is a multilayer film of alternately laminated first and second layers. The high frequency magnetic thin film of the present invention exhibits the properties such that the real part (μ′) of the complex permeability is 400 or more at 1 GHz, a quality factor Q (Q=μ′/μ″) is 4 or more, and a saturation magnetization is 14 kG (1.4 T) or more.
摘要:
A granular substance (1) having soft magnetic properties is provided which contains a matrix (3) composed of a nonmagnetic insulating organic material and ferromagnetic metal particles (2) dispersed in the matrix (3) and having a mean particle size of 50 nm or less, wherein the volume ratio of the matrix (3) is in the range of 5 to 50%. When the granular substance (1) is in the form of a film, it has a complex permeability the real part (μ′) of which is 40 or more at 1 GHz, a quality factor Q (Q=μ′/μ″ where μ″ is the imaginary part of the complex permeability) of 1 or more, and a saturation magnetization of 5 kG or more.
摘要:
A high frequency magnetic thin film characterized by comprising a first layer made of a T-L composition (here, T is Fe or FeCo, and L is one or more of C, B, and N) and a second layer comprising a Co-based amorphous alloy arranged on either of the surfaces of the first layer. The high frequency magnetic thin film is a multilayer film of a plurality of the first layers and a plurality of the second layers or desirably is a multilayer film of alternately laminated first and second layers. The high frequency magnetic thin film of the present invention exhibits the properties such that the real part (μ′) of the complex permeability is 400 or more at 1 GHz, a quality factor Q (Q=μ′/μ″) is 4 or more, and a saturation magnetization is 14 kG (1.4 T) or more.
摘要:
A multilayer film (1) is formed by alternately layering a Co-based amorphous alloy layer (2) and a natural-oxidation layer (3) of the Co-based amorphous alloy (2) on a substrate (4). A magnetic thin film for high frequencies and a magnetic device which can be used in high frequency regions of the GHz band are obtained by making a volume ratio of the natural-oxidation layer (3) to the whole multilayer film (1) fall within a range of 5 to 50%. A magnetic thin film for high frequencies is also obtainable by forming a multilayer film (1) by alternately layering the Co-based amorphous alloy layer (2) having such a characteristic that a direction of magnetic field applied in a film formation process comes to be a direction of an easy magnetization axis of the Co-based amorphous alloy layer and a natural-oxidation layer (3) of the Co-based amorphous alloy, so that the easy magnetization axis of thus formed multilayer film (1) may be perpendicular to the direction of magnetic field applied in the film formation process of the multilayer film (1).
摘要:
There can be obtained a magnetic thin film for high frequency 1 which has both a high permeability and a high saturation magnetization by combining a T-L composition layer 5 comprising a T-L composition, wherein T is Fe or FeCo, and L is at least one element selected from the group consisting of C, B and N, with a Co based amorphous alloy layer 3 disposed on either of the surfaces of the T-L composition layer 5. Further, there can be obtained a magnetic thin film for high frequency 1 which has both a high permeability and a high saturation magnetization, and at the same time has a high resistivity by further providing the magnetic thin film with, in addition to the T-L composition layer 5 and the Co based amorphous alloy layer 3, a high resistance layer 7 having an electric resistance higher than the T-L composition layer 5 and the Co based amorphous alloy layer 3.
摘要:
A high frequency magnetic thin film characterized by comprising a first layer made of a T-L composition (here, T is Fe or FeCo, and L is one or more of C, B, and N) and a second layer comprising a Co-based amorphous alloy arranged on either of the surfaces of the first layer. The high frequency magnetic thin film is a multilayer film of a plurality of the first layers and a plurality of the second layers or desirably is a multilayer film of alternately laminated first and second layers. The high frequency magnetic thin film of the present invention exhibits the properties such that the real part (μ′) of the complex permeability is 400 or more at 1 GHz, a quality factor Q (Q=μ′/μ″) is 4 or more, and a saturation magnetization is 14 kG (1.4T) or more.
摘要:
W-type ferrite has improved magnetic properties, in particular, coercive force. A high coercive force (HcJ) and a high residual magnetic flux density (Br) can be simultaneously attained by a ferrite magnetic material comprising an oxide having a composition wherein metal elements Sr, Ba and Fe in total have a composition ratio represented by the formula Sr(1−x)BaxFe2+aFe3+b in which 0.03 ≦x≦0.80, 1.1≦a≦2.4, and 12.3≦b≦16.1. The ferrite magnetic material can form any of a ferrite sintered magnet, a ferrite magnet powder, a bonded magnet as a ferrite magnet powder dispersed in a resin, and a magnetic recording medium as a film-type magnetic phase. As for the ferrite sintered magnet, there can be attained a fine sintered structure that has a mean grain size of 0.6 μm or less.
摘要:
There is provided a process for producing W-type ferrite having high magnetic properties by reducing compacting defects during wet compacting. Specifically, there is a provided a process for producing a ferrite sintered body having a main composition of the following formula (1): AFe2+aFe3+bO27 . . . (1) wherein 1.5≦a≦2.1, 14≦a+b≦18.5, and A is at least one element selected from Sr, Ba and Pb, the process comprising:a calcining step of obtaining a calcined body from a raw material compound; a first milling step of milling the calcined body to a predetermined size; a heat treatment step of holding fine powder obtained from the first milling step for a predetermined time in a predetermined temperature range in an atmosphere having an oxygen concentration of 10% by volume or less; a second milling step of milling the fine powder which has undergone the heat treatment step to a predetermined size; a step of wet compacting the fine powder which has undergone the second milling step in a magnetic field; and a sintering step of sintering the compacted body obtained by the wet compacting.
摘要翻译:提供了通过在湿式压实中减少压实缺陷来制造具有高磁特性的W型铁氧体的方法。 具体地说,提供了一种具有下式(1)的主要组成的铁氧体烧结体的方法:AFe2 + aFe3 + bO27。 。 。 (1)其中1.5 <= a <= 2.1,14 <= a + b <= 18.5,A是选自Sr,Ba和Pb中的至少一种元素,该方法包括:煅烧步骤,从 原料化合物; 将煅烧体研磨成预定尺寸的第一研磨步骤; 在氧浓度为10体积%以下的气氛中,将从第一研磨工序得到的细粉保持规定时间的规定温度范围的热处理工序; 将经过热处理步骤的细粉末研磨成预定尺寸的第二研磨步骤; 在磁场中湿式压实经过第二研磨步骤的细粉末的步骤; 以及烧结通过湿式压实获得的压实体的烧结步骤。