Toyota Jidosha Kabushiki Kaisha

The University of Tokyo

Yosuke Harashima

Noritsugu Sakuma

Takashi Miyake

Naoki Kawashima

Kazuya Yokota

Keiichi Tamai

Hisazumi Akai

Tetsuya Syoji

Munehisa Matsumoto

A rare earth magnet including a magnetic phase having the composition represented by (NdLaCe)(FeCo)B. When the saturation magnetization at absolute zero and the Curie temperature calculated by Kuzmin's formula based on the measured values at finite temperature and the saturation magnetization at absolute zero and the Curie temperature calculated by first principles calculation are respectively subjected to data assimilation. The saturation magnetization M(x, y, z, T=0) at absolute zero and the Curie temperature obtained by machine learning using the assimilated data group are applied again to Kuzmin's formula and the saturation magnetization at finite temperature is represented by a function M(x, y, z, T), x, y, and z of the formula in an atomic ratio are in a range of satisfying M(x, y, z, T)&#x3e;M(x, y, z=0, T) and 400&#x2264;T&#x2264;453.

Rare earth magnets

Growing community of inventors

Tsukuba, Japan

Yosuke Harashima