High Frequency Magnetic Thin Film, Composite Magnetic Thin Film and Magnetic Device Using Them

A high frequency magnetic thin film comprising:

• a first layer comprising a T-L composition (here, T is Fe or FeCo, L is B;
• and
• a second layer comprising a Co-based amorphous alloy arranged on either of the surfaces of said first layer.

A high frequency magnetic thin film according to 15, wherein:

• said second layer is mainly composed of Co, and comprises at least one additional element selected from the group consisting of B, C, Si, Ti, V, Cr, Mn, Fe, Ni, Y, Zr, Nb, Mo, Hf, Ta and W.

A high frequency magnetic thin film according to 15, wherein:

• said second layer is selected from the group consisting of CoZr, CoHf, CoNb, CoMo, CoZrNb, CoZrTa, CoFeZr, CoFeNb, CoTiNb, CoZrMo, CoFeB, CoZrNbMo, CoZrMoNi, CoFeZrB, CoFeSiB and CoZrCrMo.

A magnetic device comprising a high frequency magnetic thin film, wherein:

• said high frequency magnetic thin film is a multilayer film wherein a first layer comprising a T-L composition (here, T is Fe or FeCo, L is B and a second layer comprising a Co-based amorphous alloy arranged on either of the surfaces of said first layer are alternately laminated.