Exchange coupled amorphous ribbons for electronic stripes
Dynamic magnetic stripe communications devices may include a coil. An exchange coupled amorphous material may be inside the coil, for example, in the form of a ribbon. The exchange coupled amorphous material may include magnetically hard crystallites embedded in a soft magnetic amorphous matrix and/or at least one crystalline surface layer. A device may include a dynamic magnetic stripe communications device including one or more exchange coupled amorphous ribbons. The device may include more than one exchange coupled amorphous ribbon. Amorphous ribbons and/or layers of amorphous ribbons may be stacked (e.g., in alignment to one another) and/or offset at different heights. The ribbons may be in a single domain state without an external magnetic field, for example, an external magnetic field from a permanent magnet. The device may not include a permanent magnet.
1. A transaction card, comprising:
at least one coil; and
an exchange biased core including an exchange coupled amorphous material within the coil.
2. The card of claim 1 , further comprising a display.
3. The card of claim 1 , further comprising a read-head detector.
4. The card of claim 1 , further comprising a button.
5. The card of claim 1 , further comprising a light emitting diode.
6. The card of claim 1 , wherein the exchange coupled amorphous material includes magnetically hard crystallites embedded in a soft magnetic amorphous matrix.
7. The card of claim 1 , wherein the exchange coupled amorphous material includes at least one crystalline surface layer.
8. The card of claim 1 , wherein the core includes a first exchange coupled ribbon and a second exchange coupled ribbon, and
the first ribbon includes the exchange coupled amorphous material.
9. The card of claim 1 , wherein the exchange coupled amorphous material is a soft magnetic material.
10. The card of claim 1 , wherein the exchange coupled amorphous material is at least part of a material ribbon, and
the core includes a layer of material ribbons.
11. The card of claim 1 , wherein the exchange coupled amorphous material is at least part of a material ribbon, and
the card includes a plurality of stacked ribbons.
12. A mobile device, comprising:
a coil and at least one exchange coupled amorphous ribbon, the ribbon within the coil,
wherein the at least one ribbon includes a material with a preferred orientation of magnetization, and
no external bias magnetic field is provided to the at least one ribbon in the direction of the preferred orientation.
13. The card of claim 1 , wherein the at least one exchange coupled amorphous material is anisotropic, and
the anisotropy is unidirectional.
14. The card of claim 1 , wherein the core includes a first exchange coupled ribbon and a second exchange coupled ribbon,
the first ribbon includes the exchange coupled amorphous material, and
the first and second ribbons are each in a single domain state.
15. The card of claim 1 , wherein the core includes a first exchange coupled ribbon and a second exchange coupled ribbon,
the first ribbon includes the exchange coupled amorphous material, and
the first and second ribbons are each in a same single domain state.
16. The card of claim 1 , wherein the exchange bias of the core is a bias field internal to the exchange coupled amorphous material.
17. The card of claim 1 , wherein the core includes a first exchange coupled ribbon and a second exchange coupled ribbon,
the first ribbon includes the exchange coupled amorphous material, and
the exchange bias of the core includes a bias field internal to the first and second ribbons.
18. The card of claim 1 , wherein the core includes a first exchange coupled ribbon and a second exchange coupled ribbon,
the first ribbon includes the exchange coupled amorphous material,
the exchange bias of the core includes a bias field internal to the first and second ribbons, and
the first and second ribbons are exchange coupled.