MAGNETORESISTANCE EFFECT DEVICE, MAGNETIC HEAD, MAGNETIC RECORDING SYSTEM, AND MAGNETIC RANDOM ACCESS MEMORY
First Claim
1. A magnetoresistance effect device having a spin valve structure including a buffer layer at a bottommost layer, a pinned ferromagnetic layer above that, a nonmagnetic metal intermediate layer, and a free ferromagnetic layer, wherein said free ferromagnetic layer is comprised of one of the following (1) and (2):
- (1) a composition in the region of a CoFeAl ternary system composition diagram obtained by connecting a point A, point B, point C, point D, point E, point F, and point A by straight lines in that order for a point A (55,10,35), point B (50,15,35), point C (50,20,30), point D (55,25,20), point E (60,25,15), and point F (70,15,15) when expressing the coordinates of compositions as (Co content, Fe content, Al content [unit of each content being atm %]) and(2) a composition in the region of a CoMnAl ternary system composition diagram obtained by connecting a point A, point B, point C, point D, point E, point F, and point A by straight lines in that order for a point A (44,23,33), point B (48,25,27), point C (60,20,20), point D (65,15,20), point E (65,10,25), and point F (60,10,30) when expressing the coordinates of the compositions as (Co content, Mn content, Al content [unit of each content being atm %]),said buffer layer being comprised of a bottom layer of an amorphous metal buffer layer and a top layer of a nonmagnetic metal buffer layer.
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Abstract
A CPP type magnetoresistance effect device having a synthetic ferri-pinned spin valve structure including a buffer layer, pinned ferromagnetic layer, nonmagnetic metal intermediate layer, and free ferromagnetic layer and having a free ferromagnetic layer made a specific composition of CoFeAl or CoMnAl, the buffer layer comprising an amorphous metal bottom layer and a nonmagnetic metal top layer. This magnetoresistance effect device increases the output ΔRA, reduces the coercivity Hc and the amount of shift Hin from a zero magnetic field to increase the sensitivity, and increases the magnetic field Hua of the resistance half point to increase the pin stability. A magnetic head, magnetic recording system, and magnetic random access memory using this magnetoresistance effect device are also disclosed.
37 Citations
14 Claims
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1. A magnetoresistance effect device having a spin valve structure including a buffer layer at a bottommost layer, a pinned ferromagnetic layer above that, a nonmagnetic metal intermediate layer, and a free ferromagnetic layer, wherein said free ferromagnetic layer is comprised of one of the following (1) and (2):
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(1) a composition in the region of a CoFeAl ternary system composition diagram obtained by connecting a point A, point B, point C, point D, point E, point F, and point A by straight lines in that order for a point A (55,10,35), point B (50,15,35), point C (50,20,30), point D (55,25,20), point E (60,25,15), and point F (70,15,15) when expressing the coordinates of compositions as (Co content, Fe content, Al content [unit of each content being atm %]) and (2) a composition in the region of a CoMnAl ternary system composition diagram obtained by connecting a point A, point B, point C, point D, point E, point F, and point A by straight lines in that order for a point A (44,23,33), point B (48,25,27), point C (60,20,20), point D (65,15,20), point E (65,10,25), and point F (60,10,30) when expressing the coordinates of the compositions as (Co content, Mn content, Al content [unit of each content being atm %]), said buffer layer being comprised of a bottom layer of an amorphous metal buffer layer and a top layer of a nonmagnetic metal buffer layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification