Magnetic element, pressure sensor, magnetic head and magnetic memory

A magnetic element, comprising:

• a first layer including ruthenium;
• a first magnetic layer;
• a second magnetic layer provided between the first layer and the first magnetic layer;
• a first nonmagnetic layer provided between the first magnetic layer and the second magnetic layer;
• a second layer including tantalum, the second layer contacting the first layer and being provided between the first layer and the second magnetic layer, a lattice plane spacing of the second layer in a first direction being not less than 0.23 nm and not more than 0.25 nm, the first direction being from the first layer toward the first magnetic layer;
• a third magnetic layer including manganese and being provided between the second layer and the second magnetic layer;
• a fourth magnetic layer provided between the second magnetic layer and the third magnetic layer;
• and
• a second nonmagnetic layer provided between the second magnetic layer and the fourth magnetic layer,
• the second magnetic layer including iron, the fourth magnetic layer including iron, and the second nonmagnetic layer including ruthenium,
• a spectrum of electron energy loss spectroscopy of iron having a first peak at a first position corresponding to the fourth magnetic layer and a third peak at a third position corresponding to the second magnetic layer,
• a spectrum of electron energy loss spectroscopy of ruthenium having a second peak at a second position corresponding to the second nonmagnetic layer,
• a spectrum of electron energy loss spectroscopy of manganese having a first value, a second value, a third value, a fourth value, and a fifth value, the first value corresponding to the first position, the second value corresponding to the second position, the third value corresponding to the third position, the fourth value corresponding to a fourth position corresponding to the first nonmagnetic layer, the fifth value corresponding to a fifth position corresponding to third magnetic layer,
• the first value being larger than the second value,
• the second value being larger than the third value,
• a ratio of the fourth value to the fifth value is 0.04 or less, and
• a ratio of the third value to the fifth value is 0.1 or less.