Magnetic oscillation element and spin wave device

A magnetic oscillation element, comprising:

• a first electrode;
• a second electrode;
• a first magnetic layer provided between the first electrode and the second electrode, the first magnetic layer having a variable magnetization direction;
• a second magnetic layer provided between the first electrode and the first magnetic layer, the second magnetic layer having a fixed magnetization direction;
• and
• a first spacer layer being nonmagnetic and provided between the first magnetic layer and the second magnetic layer,
• the first magnetic layer including:
• a ferromagnetic fourth magnetic layer;
• and
• a ferromagnetic fifth magnetic layer contacting the first spacer layer between the fourth magnetic layer and the first spacer layer,
• a thickness of the first magnetic layer in a first direction connecting the first electrode and the second electrode being greater than 2 times a thickness of the fifth magnetic layer in the first direction,
• the thickness of the first magnetic layer being less than a maximum width of a first surface of the second electrode on the first magnetic layer side,
• the first magnetic layer having a first edge portion provided outside the first surface when viewed along the first direction, a width of the first edge portion in a direction perpendicular to a tangent of an edge of the first surface being not less than an exchange length of the fifth magnetic layer.