No, it is not possible to create an object that can be attracted by the Earth's magnetic force but not repelled by its gravitational force. The forces of magnetism and gravity are fundamentally different and cannot be directly compared or interchanged.
Gravitational force is a universal force of attraction that exists between any two objects with mass. It is a fundamental force of nature and acts on all objects with mass, regardless of their composition or properties. The force of gravity always attracts objects towards one another.
On the other hand, magnetic force arises due to the presence of magnetic fields and is caused by the motion of electric charges. It acts on objects that are magnetic or have magnetic properties, such as ferromagnetic materials (iron, nickel, cobalt, etc.) or objects with magnetized components. Magnetic forces can either attract or repel magnetic objects, depending on the orientation and properties of the interacting magnetic fields.
Since gravity and magnetism are distinct forces with different causes and behaviors, it is not possible to create an object that can selectively respond to one force while remaining unaffected by the other. All objects with mass will experience the force of gravity, whereas the magnetic force acts only on objects with magnetic properties or in the presence of magnetic fields.