Magnetoresistive effect device

A magnetoresistive effect device comprising:

• a first magnetoresistive effect element and a second magnetoresistive effect element each including a magnetization fixed layer, a spacer layer, and a magnetization free layer in which a magnetization direction is changeable;
• a first port via which a high-frequency signal is input;
• a second port via which a high-frequency signal is output;
• a signal line;
• and
• a direct-current input terminal, wherein
• the first port and the second port are connected to each other via the signal line to form a connection of the first port and the second port,
• the first port, the first magnetoresistive effect element and the second magnetoresistive effect element are connected in series to form a series connection with the first magnetoresistive effect element connected to the first port via the signal line and with the second magnetoresistive effect element connected to the first magnetoresistive effect element, such that the first magnetoresistive effect element is between the first port and the second magnetoresistive effect element in the series connection of the first port, the first magnetoresistive effect element and the second magnetoresistive effect element,
• the series connection of the first port, the first magnetoresistive effect element and the second magnetoresistive effect element is in parallel to the connection of the first port and the second port, and
• the direct-current input terminal is connected to the signal line.