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Products and processes for providing haptic feedback in a user interface are disclosed. One exemplary embodiment of an apparatus comprises a first element comprising a first surface, a second element comprising a second surface, and an actuator configured vary a force between the first and second su

Products and processes for providing haptic feedback in a user interface are disclosed. One exemplary embodiment of an apparatus comprises a first element comprising a first surface, a second element comprising a second surface, and an actuator configured vary a force between the first and second surfaces. In one embodiment, the second element may be configured to be displaced relative to first element in a degree of freedom. In another embodiment, at least one of the first surface and the second surface may comprise a thermoplastic polymer.

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1. An apparatus comprising: a first element comprising a first surface;a second element comprising a second surface and configured to be displaced relative to the first element in a degree of freedom, at least one of the first surface and the second surface comprising a thermoplastic polymer, wherei

1. An apparatus comprising: a first element comprising a first surface;a second element comprising a second surface and configured to be displaced relative to the first element in a degree of freedom, at least one of the first surface and the second surface comprising a thermoplastic polymer, wherein a distance between the first surface comprising a magnetic target and the second surface comprising a magnetic core comprises a range between approximately 0.0005 and approximately 0.0040 inches; andan actuator configured to vary a force between the first surface and the second surface. 2. The apparatus of claim 1, further comprising a manipulandum coupled to at least one of the first element and the second element, wherein the actuator is operable to communicate a haptic effect through the manipulandum. 3. The apparatus of claim 2, wherein the manipulandum comprises one of: a joystick, a knob, a scroll wheel, or a slider. 4. The apparatus of claim 1, wherein the degree of freedom comprises a rotary degree of freedom. 5. The apparatus of claim 1, wherein the force comprises a component substantially normal to the degree of freedom. 6. The apparatus of claim 1, further comprising a biasing element coupled to the actuator. 7. The apparatus of claim 1, further comprising a housing, wherein the housing is a housing of one of: a mobile phone, a personal digital assistant, a camcorder, a control knob, a computer mice, or a joystick. 8. An apparatus comprising: a magnetic target comprising a surface;a magnetic core comprising a surface disposed in facing opposition to the surface of the magnetic target, wherein a distance between the surface of the magnetic target and the surface of the magnetic core comprises a range between approximately 0.0005 and approximately 0.0040 inches; anda frictional element interposed between the surface of the magnetic target and the surface of the magnetic core, the frictional element comprising a thermoplastic polymer. 9. The apparatus of claim 8, wherein the frictional element comprises an acetal polymer. 10. The apparatus of claim 8, wherein the magnetic target comprises a transition metal alloy. 11. The apparatus of claim 8, wherein the magnetic target comprises a nickel-plated steel. 12. The apparatus of claim 8, wherein the frictional element is coupled with the magnetic target or the magnetic core. 13. The apparatus of claim 8, further comprising a manipulandum coupled to at least one of the magnetic target or the magnetic core. 14. The apparatus of claim 13, wherein the manipulandum comprises one of: a joystick, a knob, a scroll wheel, or a slider. 15. The apparatus of claim 8, further comprising a housing, wherein the housing is a housing of one of: a mobile phone, a personal digital assistant, a camcorder, a control knob, a computer mouse, or a joystick. 16. A method comprising: providing a magnetic target comprising a surface;providing a magnetic core comprising a surface disposed in facing opposition to the surface of the magnetic target, wherein a distance between the surface of the magnetic target and the surface of the magnetic core comprises a range between approximately 0.0005 and approximately 0.0040 inches; andinterposing a frictional element between the surface of the magnetic target and the surface of the magnetic core, the frictional element comprising a thermoplastic polymer. 17. The method of claim 16, wherein the frictional element comprises an acetal polymer. 18. The method of claim 16, wherein the magnetic target comprises a transition metal alloy. 19. The method of claim 16, wherein the magnetic target comprises a nickel-plated steel. 20. The method of claim 16, wherein the frictional element comprises a ring. 21. The method of claim 20, wherein the magnetic core comprises a first diameter and the frictional element comprises a second diameter, the first diameter greater than the second diameter.