Patent ID: 7596058

Claim:
A magnetic recording medium comprising: a backing layer including a first magnetic layer, a second magnetic layer and a third magnetic layer, the second magnetic layer being formed over the first magnetic layer, ferrimagnetic and magnetized in a direction opposite to the first magnetic layer, the third magnetic aver being formed over the second magnetic layer and magnetized in a direction opposite to the second magnetic layer; and a perpendicular magnetic recording layer for recording a magnetic information formed over the backing layer, an antiferromagnetic exchange interconnection being formed between the first magnetic layer and the second magnetic layer and formed between the second magnetic aver and the third magnetic layer, a saturation magnetization strength Ms 2 of the second magnetic aver at a first temperature and a saturation magnetization strength Ms 3 of the third magnetic aver at the first temperature having a relationship of Ms 2 ≦Ms 3 , and the saturation magnetization strength Ms 2 of the second magnetic layer at a second temperature higher than the first temperature and the saturation magnetization strength Ms 3 of the third magnetic aver at the second temperature having a relationship of Ms 2 ≧Ms 3 .